Remember that Poke app that Facebook released a couple years ago? Yeah, were guessing no, which might explain why the company has decided to put the kibosh on it and pulled it from the App Store. If you did manage to snag the app back in the day, you might recall that it allowed you to not only poke, but also send a message, picture or video to Facebook friends, with those missives set to expire after 1, 3, 5 or 10 seconds.