Shopping online can be a tricky thing to navigate, which is why online reviews come in handy. The comment sections where people write their honest opinions of a product, restaurant or hotel are helpful resources for figuring out whether or not something is worth buying.

In 2012, 57% of restaurant-goers said they rely on online reviews before choosing where to dine. In addition, 90% of Yelp users said a positive review influences their choices.

See also: 10 Weirdest Things for Sale on eBay

But here's the bad news: Not all of those reviews are reliable. Companies such as TripAdvisor, an aggregate site for making travel plans, have recently come under fire for allegedly failing to prevent fake reviews. For example, some hotels pay reviewers to post positive reviews without ever stepping foot in the establishment. They do it to boost business, but that comes at the cost of a surprised and angry customer who feels tricked by the Internet.

Now it's time to wise up. Here are six ways you can spot a fake online review.

1. The reviewer hasn't reviewed anything else.

Some consumers may like or hate a particular product or service so much that they feel compelled to write a single online review. However, one extremely positive or negative comment by a reviewer who has never reviewed anything else could be a red flag.

Make sure to note the username and click to see his or her history.

2. The reviewer posts multiple reviews with similar language.

If one reviewer has commented on multiple hotel listings with reviews that all sound eerily similar to one another, your instincts should be on high alert. This could be a clear sign of someone who's getting paid per review (and is being pretty lazy about hiding it).

3. The reviewer's language is oddly specific.

Image: Yelp

Let's say you're reading a review for a product that has a really long name, like the "DEFG HydraHelix Smartwatch 2000x Chrome." Most commenters are not going to write out the whole name multiple times, and will instead shorten it to something like the "HydraHelix."

Fake reviewers will go all out, stating the full name as often as possible, because it juices up SEO points for the product.

4. Too! Much! Enthusiasm!

If there's a lot of excessive punctuation and overly positive language, put on your skeptical specs.

5. A hotel review focuses too much on family and activities.

A 2013 study by Cornell University found that fake hotel reviewers would often emphasize all the great activities and family fun the place provides, whereas real reviewers focused mostly on the hotel itself.

It's a ploy to make a review sound as personal and relatable as possible. Plus, it's a way for the reviewer, who's likely never stepped foot in that hotel, to avoid writing details about the hotel itself.

6. Filter out the phonies.

Many sites with commenting options require you to log in via social media. Image: Mashable

To combat fake reviews, here are some nearly foolproof ways to determine if a comment is legitimate: