There's no end to the amount of data collection Facebook has on us. They could probably tell you more about me than I could tell you about myself. In fact, the old days of internet anonymity are pretty much gone unless you're a high level hacker (I know how to uninstall programs. Does that count?). A lot of what Facebook collects is right out there, broadcasted into the open. I'm talking specifically about location services.
It looks like someone wanted an excuse to compliment themselves on Facebook using the old "someone else posted this" trick. The dumby claims to have left their computer logged on to a library computer, however, Facebook is too slick for that. The "via mobile" is clear as day. Time to revise that post to "I have nice hair, I flirt too much, AND I'M A DIRTY LIAR."