What's Up With Facebook Stock Today?

Facebook, Inc.FB shares are trading lower by 3.3% at $308.54 after Citigroup downgraded the stock from Buy to Neutral and announced a price target of $320 per share.

Facebook is the world's largest online social network, with 2.5 billion monthly active users. Users engage with each other in different ways, exchanging messages and sharing news events, photos and videos.

Facebook’s ecosystem consists mainly of the Facebook app, Instagram, Messenger and WhatsApp.