Recently ReadWrite published a post explaining that Facebook now
…officially wants teens to overshare as well, in ways that might also make them better fodder for advertising.
Facebook announced today that teenage users can now make their posts public on Facebook. Previously, the social network limited users between the ages of 13 and 17 to distributing posts to their extended network—i.e. friends and friends of friends. Teenage users also now have the option to turn on the “follow” setting for their accounts, letting public updates appear in news feeds.