Facebook CEO Mark Zuckerberg worked with a few engineers to slap together the Facebook Poke app one day as “a joke.” However, Facebook ended up publishing that app to the Apple App Store over a year ago. Now Facebook has pulled that app from the Apple App Store along with the Camera app. The Poke app was supposed to be similar to Snapchat and the Camera app was like Instagram. Facebook spent 12 days building the Poke app total. And the best features from the Camera app was rolled into the Facebook iPhone app.