I'm usually the last person to get new features on Facebook. It took days before I started seeing the "trending" section on the main page and I still haven't been updated to the redesigned Facebook, though the latter may end up getting scrapped anyway.
So when I updated a few of the apps on my iPhone on Saturday and saw that I suddenly had access to Graph Search on the Facebook app, I just assumed everyone else did too. Apparently not so much.
See also: How to Use Facebook’s Graph Search to Supercharge Your Professional Network
Facebook confirmed over the weekend that it's testing Graph Search on mobile with a small group of users, a little more than a year after introducing it on desktop. The news isn't entirely unexpected; Facebook CEO Mark Zuckerberg noted during the company's fourth quarter earnings call last week that it would roll out the intelligent social search engine to mobile "pretty soon."
Beyond the new functionality of the graph search, which I'll get to in a moment, the move is somewhat symbolic for the company. Graph Search was really the last major feature Facebook released for desktop first. Zuckerberg admitted as much on the earnings call, saying, "We haven't even rolled out our mobile version of Graph Search yet and we're a mobile company."

If it weren't for the notification window above, you wouldn't immediately know anything had changed with the Facebook app. Just like with the desktop version, the change is only apparent when you click the search bar in the top-left corner.
Those with Graph Search now see a drop-down menu after tapping on the search bar, suggesting several new categories for searches, including people, photos and posts. (My version also includes a list of trending topics, which previously was not available in the app.)

Facebook's search feature in the app without Graph Search (left) and with Graph Search (right).
In fact, Facebook offers suggestions to formulate an entire search query, assuming you're interesting in searching for things like "people who were born before X year," or "people who speak Y language."

The app automatically suggests search queries to make the most of Graph Search.
You can perform these same searches on desktop, though. The real potential for Graph Search on mobile, and something that may boost its potential to generate revenue, is tapping into more real-time, location-based searches.
On a whim, I searched for "restaurants that my friends visited nearby" (Facebook didn't offer any prompts for doing this). Sure enough, Facebook used the GPS on my phone to pull up my current location and then cross-referenced it with the restaurants my contacts had highlighted in the past.

With one exception, all the suggestions were more than a mile away, surprising considering there are restaurants on every block in New York City. Maybe my friends don't eat out much. More likely, they just don't share every restaurant they eat at on Facebook.
In the year since Facebook unveiled Graph Search on desktop, I used it maybe five or ten times, and most of those were during the first week to test it for work. If the mobile version of Graph Search can pull up more information that's useful in the moment, like the example above, that might change. For now, it's mostly just useful for saving a few seconds when searching for photos and posts from friends.
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