WhatsApp's earlier announcement that it's leaving the BlackBerry ecosystem was apparently only the beginning of Facebook's exodus from the platform. The world's biggest social network and its Messenger app will stop working on the BlackBerry OS, including BB10, by the end of 2016. In a blog post on the company's website, the app team said Facebook decided to "discontinue support of their essential APIs for BlackBerry." They tried to change their minds, but it sounds like Zuckerberg and his crew wouldn't budge -- the team even started a Twitter campaign in an effort to get Facebook to reconsider.