After connecting to Facebook Poke with a Facebook account, users can take a video or photo, write a message, or send a standard poke notification to friends who are also Facebook users. Each message lasts only a few seconds before expiring, after which time it is no longer visible.
If a screenshot is taken, users are notified with a bright orange icon on the feed, which is the same functionality found in Snapchat. Users can browse through sent messages in Poke by tapping and holding on a message.
Media sent via Facebook Poke is not visible in the standard Facebook app, but people will get a Facebook notification to download Facebook Poke to see Poke messages. Like the rest of Facebook's apps, Poke has a menu for reporting inappropriate content.
Facebook Poke is a free download on Apple's App Store. [Direct Link]