Facebook has launched “Facebook Poke” for iPhone. The massive social network says this is a “fun and easy to say hello to friends wherever you are.” Could be a good time as this gives you the option to send a quick message, photo, or video to the long list of Facebook friends you never talk to. Facebook also says that you can send a message to one person, or a group of friends, and “each message expires after a specific time you’ve set, either 1, 3, 5 or 10 seconds. When time runs out, the message disappears from the app.” You can bet that there’ll be some NSFW messages flying around. No word on when this will be coming to Android, BlackBerry or Windows Phone.