Here's a neat little app that's good for getting into poking wars with your friends on facebook. You need to configure facebook settings to send you a text message whenever you get poked, and then autopoke will instantly poke the person back for you right away.
This app runs in the background and does it's job quite well. There are no settings or anything to configure. Just run it once and it'll do it's job.
My friends don't know how I'm always able to poke them back at all hours of the day and night and it's funny when they try to outpoke me.
It isn't especially useful or anything but it's a good app for a bit of humour.
Screenshot and qr code below: