Google cofounders Sergey Brin, left, and Larry Page. AP/Ben Margot Google has built a $580 billion empire by keeping its innovation engine running ahead of the competition. But on Wednesday the company pulled off an impressive, and curious, feat: It wowed the public with an eight-year-old idea.

Google unveiled a new set of features for its popular Maps app that lets users share their locations with friends and contacts in real time. Thanks to this update, Google Maps users will now be able to quickly let friends know if they're running late to a meeting or stuck in traffic.

It's a compelling idea. And if you're wondering why Google hadn't thought of this earlier, the answer is: It did.

In 2009, when smartphones were still in their infancy, Google introduced something called Latitude.

The Latitude app, to quote Google's blog post announcing it, "allows you to share your location with your friends and to see their approximate locations, if they choose to share them with you." In other words, it's almost the exact same feature Google is now touting as the hot new thing.

Take a look at the two side by side.

Here is Google Latitude, circa 2009:

And here is a screenshot of the new Google Maps location-sharing feature:

The interfaces look almost identical, even though technology has changed dramatically in the past eight years. (The initial version of Google Latitude was for BlackBerry phones.)

At the time Latitude was launched, the app drew widespread privacy concerns. Privacy International, a European watchdog group, published a report highlighting the risk that users might not be aware Latitude was enabled and could thus track their whereabouts. A Google spokeswoman told Computerworld at the time that the company took user feedback about privacy seriously and was adding notifications to alert users when Latitude was turned on.

Hello again

Eight years later, the privacy concerns haven't gone away, but by and large, the outcry has been a footnote to the story. Instead, most of the coverage has focused on the benefits of sharing locations — for example, allowing parents to keep track of their smartphone-toting children — not fear-mongering about how it could go wrong.

The world has changed since 2009 when Google first tried this. Two billion people are on Facebook's social network. Millions of people wear bracelets that record their physical activity. The new hot gadget du jour is an eavesdropping microphone-speaker device with an innocent name like Alexa that consumers voluntarily put in their kitchens to get quick weather updates and sports scores.

It's not the first time we've seen a once controversial tech product resurface in new packaging a few years later to a much warmer reception. Just look at how much cooler people think Snap's video-recording sunglasses are now, only a few years after Google Glass.

The Google Maps location-sharing comeback is a good reminder of how quickly technology moves and how fluid our seemingly deeply rooted societal norms might be.

More importantly, it's a good time to reflect and take stock of what we give up (and what we gain) every time we embrace the latest life-changing tech toys and services.