You can't go anywhere these days without hearing about the elusive, purportedly mystical powers of influencer marketing.

But is this buzzword-laden tactic actually worth your time and energy?

According to a recent study comprised of marketers from a variety of industries, 94% said influencer marketing was an effective campaign strategy. That's great news for marketers -- right?

Not so fast. Even though a majority of marketers believe influencer marketing is a viable tactic, it's still incredibly challenging to report accurately on influencer campaign ROI. In fact, 78% of marketers said that determining the success of influencer marketing campaigns would be a top challenge this year.

So even though the tangible benefits of influencer marketing -- follower engagement, driving traffic, and creating more authentic content -- seem clear-cut, there's still a lot of progress to be made in making this form of campaign measurable for agencies and marketers.

Influencer Marketing Influencer marketing is designed to tap into an existing community of engaged followers on social media. Influencers are specialists in their niches. These individuals have influence over an audience you might be trying to reach, and can be helpful marketing to those buyers.

Let's back up for a minute. How exactly do you perform influencer marketing, and how does it differ from the traditional celebrity spokesperson advertising model?

There is some overlap between celebrity endorsements and influencer marketing campaigns. But fans of influencers trust that their endorsement of a product or brand comes from a well-researched, more holistic place, rather than something as simple as a signed contract between a brand and a person of influence.

And while there is often a formal agreement in place between both parties, influencers tend to be more selective about their affiliations, choosing to partner with brands that reflect their unique personal brands and won't alienate their followers.

With that in mind, here are four things you need to keep in mind when launching an influencer marketing campaign:

Expertise: Would the content of your campaign be appropriate coming from this influencer, given what he or she is famous for?

Would the content of your campaign be appropriate coming from this influencer, given what he or she is famous for? Reach: Can this influencer engage your audience? Does she specifically have reach on the social media channels where your audience spends its time?

Can this influencer engage your audience? Does she specifically have reach on the social media channels where your audience spends its time? Demographic: Is this person's following similar to your company's buyer persona? Does he or she affect the same people?

Is this person's following similar to your company's buyer persona? Does he or she affect the same people? Notoriety: Is this influencer well liked? Is his/her fame split between admiration and condemnation, or are they a person of mass appeal? (The latter is what you want, so as to not alienate potential customers.)

In other words, celebrity product endorsements are less about engagement and more about attaching a person's fame and name recognition to a particular brand -- regardless of who specifically follows their career. For brands, this type of campaign is much more about grabbing the attention of a wide audience than tapping into a very specific niche.

To give you an idea of how brands -- both big and small -- are leveraging the power of influencers in their marketing efforts, we've put together a list of ten influencer-driven campaigns. Check them out below and decide for yourself: Is influencer marketing worth the hype?

Influencer Marketing Examples Sprint: #LiveUnlimited Old Navy: Boys & Girls Club of America Fiji Water: "Bodyworewhat" Kaikatsu Club: NETCafe VR H&M: Fall Studio Collection Sperry: Boat Shoes on Instagram Samsung: Note 7 Launch Diageo: My Tales of Whiskey GAP: Styld.by Stride Gum: Mad Intense Gum Naked Juice: Sponsored Instagram Posts Loeffler Randall: LR Ambassadors Glossier: Regular Women

1. Sprint: #LiveUnlimited

Influencers: Lele Pons, Gerard Adams, Prince Royce, Bradley Martyn, Rachel Cook

Not only did Sprint cause Verizon's famous "can you hear me now?" guy to switch to Sprint, but the company has collaborated with musicians, entrepreneurs, and actors to gain the attention of a massive young audience.

Its latest influencer campaign uses the hashtag #LiveUnlimited, and features people who have massive social media presences. The best part is these people naturally embody the appearance and lifestyle of #LiveUnlimited. Elite Daily founder Gerard Adams and internet personality Lele Pons are just two of them.

Sprint introduces all five influencers (listed above) in this video ad:

2. Old Navy: Boys & Girls Club of America

Influencer: Alex Rodriguez

Old Navy is a veteran of influencer marketing, having partnered with fashion and lifestyle bloggers all over Instagram to promote various lines of Old Navy clothing. For Black Friday, the company doubled down on this strategy by partnering with New York Yankee retiree Alex Rodriguez to raise money for the Boys & Girls Club of America (BGCA). Being an alumnus of the BGCA, Rodriguez's promotion helped Old Navy raise $1 million as part of sales during Black Friday alone.

As a proud @BGCA_Clubs , I’m excited to help @OldNavy in their goal to donate $1 MILLION to Boys & Girls Clubs this holiday season.



This Fri only, for every $1 pair of Cozy Socks you buy in-store, @Oldnavy donate $1 to @BGCA_Clubs — up to 1M! https://t.co/wEKhASEmuc #Ad — Alex Rodriguez (@AROD) November 19, 2018

3. Fiji Water: Bodyworewhat

Influencer: Danielle Bernstein

You know the water brand, Fiji, but you might know its campaign partner better by the Instagram name, weworewhat.

Danielle Bernstein's fashion blog, We Wore What, recently joined Fiji Water to create Bodyworewhat, an influencer marketing campaign offering eight-minute workout videos with Bernstein and personal trainer Eric Johnson.

This campaign was meant to demonstrate Fiji's commitment to hydrating those who want to look and feel as fit as Bernstein, while helping her fans get there with all the right motivators.

4. Kaikatsu Club: NETCafe VR

Influencer: Enakorin

Not all influencers are based in sports, fashion, or entertainment -- not in Asia, anyway. The cafe chain, Kaikatsu Club, recently launched a virtual reality feature across its Japan locations, where customers can play various VR video games while enjoying a drink or a meal. And who better to help spread the word than Japan's popular TV personality and cosplayer, Enakorin.

Enakorin is well known by fans of anime, a Japanese artform responsible for many comics and TV shows across the country. Enakorin is also known for her love of video games, making her a perfect choice to represent Kaikatsu's new VR entertainment platform. Both of them teamed up with TimeLine Japan on YouTube to talk about it.

5. H&M: Fall Studio Collection

Influencers: Julie Sariñana, Ela Velden

H&M has one of the largest Instagram followings of any fashion brand on social media today, due in large part to its influencer campaign with women who reflect H&M's style all by themselves.

Fashion blogger Julie Sariñana and model Ela Velden are two influencers with whom H&M partnered for its fall 2017 catalogue. Sariñana loved the clothing so much, she promoted it from her own Instagram account:

6. Sperry: Boat Shoes on Instagram

Influencers: Sperry Enthusiasts

Toward the end of 2016, the boat shoe brand, Sperry, began working with more than 100 micro-influencers on Instagram to create engaging content for its followers. Sperry identified fans of the brand on Instagram who were already sharing high-quality photos of its products, and started inviting these users to develop visual content for its official Instagram account.

7. Samsung: Note 7 Launch

Influencer: CyreneQ

New smartphones are unveiled everyday. So, when Samsung released its Note 7 in 2016, it set out to make sure people knew about it. The company partnered with CyreneQ, a professional Snapchat artist and designer with a huge subscriber base, to broadcast its launch to a mobile audience that it wanted buying its new product.

Cyrene used her Snapchat account to document her journey to the event and ultimately give her audience a sneak peak of the new device. Using Snapchat's 10-second video format, she posted clips showing her followers some of the device's new features. See how CyreneQ's Snapchat designs look for the brands she's worked with here.

8. Diageo: My Tales of Whisky

Influencer: Nick Offerman

Diageo, the parent company of Scottish whiskey brands Lagavulin and Oban, was awarded a Shorty Award for Best Influencer Marketing Campaign for this yule log video starring Parks and Recreation's Nick Offerman.

The 44-minute video shows Offerman sitting by a crackling fireplace, staring broodingly into the camera, and occasionally savoring a sip of his drink. Thanks to the simple seasonal premise and Offerman's unique brand, the video was a viral hit.

9. GAP: Styld.by

Influencers: Refinery29, Celebrity Blogs

GAP's successful Styld.by campaign featured a number of influential social media personalities from blogging giants like Refinery29 and WhoWhatWhere, showing how they incorporate GAP clothing into their personal wardrobes. Users viewing the influencers' posts on social media were given options to "Shop this Look" conveniently in the caption of photos.

Thanks to the involvement of multiple influencers from different niches, GAP's campaign had enormous reach.

10. Stride Gum: Mad Intense Gum

Influencer: DJ Khaled

If anyone has figured out how to gain a loyal following on Snapchat, it's hip-hop artist and producer DJ Khaled. Once a minor figure in the music world, Khaled has enjoyed an unprecedented level of success on the ephemeral photo-sharing app, with each of his snaps garnering over 3 million views on average.

"DJ Khaled has completely cracked the platform," said Emmanuel Seuge, senior vice president for content at Coca-Cola, one of Snapchat’s major advertisers. "He’s the king of Snapchat."

His "King of Snapchat" status means Khaled is in high-demand for influencer campaigns with brands. He regularly takes part in "Snapchat takeovers," where a brand hands over the reigns of their corporate Snapchat to Khaled for a brief period of largely unfiltered antics.

Working with W+K London, Stride Gum launched a Snapchat takeover campaign with Khaled last year to promote its "Mad Intense Gum" campaign. The brand called the takeover "an unpredictable, fun day for all his followers."

11. Naked Juice: Sponsored Instagram Posts

Influencer: Kate La Vie

This bottled smoothie brand is edging its way into the beauty, fashion, and health scene on Instagram with help from key influencers in the space. Lifestyle bloggers like Kate La Vie (below) share sponsored posts featuring snapshots of their daily outfits and beauty essentials -- including a strategically placed Naked Juice in the mix.

12. Loeffler Randall: LR Ambassadors

Influencers: Creative Businesswomen

High-end accessory and footwear brand Loeffler Randall has become a favorite among artists, bloggers, and fashion insiders, thanks in big part to the company's commitment to involving social media influencers in its marketing campaigns.

The brand's "LR Ambassadors" include a diverse group of writers, painters, florists and other creative businesswomen "leading dynamic lives." In the brand's own words, their LR Ambassadors are "cool girls doing cool things."

In addition to profiling its LR Ambassadors on the company blog, Loeffler Randall shares pictures of its ambassadors wearing LR shoes and accessories on Instagram, using the hashtag #LRambassador.

13. Glossier: Regular Women

Influencers: All Women

This Manhattan-based beauty startup (which was recently named one of Fast Company's Most Innovative Companies of 2017) owes much of their seemingly overnight cult status to their ever-expanding network of super fans and micro-influencers -- those people who may have high influence, but low individual reach.

Instead of paying a few big names to promote their minimal skincare and cosmetics, the brand relies on "regular women" to spread the word.

"What's very motivating to us is this idea of every single woman being an influencer," Glossier CEO Emily Weiss told Quartz. Glossier recently introduced a referral program to enable its more influential followers to offer product discounts and other incentives to their unique networks.