Speaking of the Poke app, TechCrunch’s Josh Constine answered the big (and most obvious) question:
So essentially, Facebook only stores your Pokes for two days so if anyone reports you for offending them, like by sending unwanted images of what’s in your pants, it can see if the accusations are true. Then it effectively deletes the Pokes, and by 90 days after there’s absolutely no way to recover the contents of a message. Facebook is trying to cut down that window, which could help it appear just as secure as Snapchat.
Good that Facebook isn’t trying to use this app to get more data into their system. Though I do wonder if they’re noting information one-step back — that is, who is poking whom and how often? That’s potentially valuable social graph information.