You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did the facebook messenger app come out?" whose answer is August 2011.
Each document should contain about 30 words, and these documents should contain useful information.

Query: facebook messenger app release date
Useful Output:

Doc 1: Franz 5. Get back on top of your messaging. Franz is your messaging app for WhatsApp, Facebook Messenger, Slack, Telegram and many many more. Download Franz.
Doc 2: In 2008, Facebook launched its internal messaging service called Facebook Messenger. This feature allowed users to communicate via instant
Doc 3: Facebook users on Android devices are being notified that they will no longer be able to access messages without the Messenger app.
Doc 4: A Tizen app was released on July 13, 2015. Facebook launched Messenger for Windows 10 in April 2016. In October 2016, Facebook released Messenger Lite, a
Doc 5: In August, Facebook finally pulled the plug on messages within the main Facebook app, forcing users instead to download its separate Messenger app.