"The overall opportunity here is a lot larger than what we have built in terms of Facebook and Instagram." Integration could make it much more difficult, if not impossible, to later separate out and spin off Instagram and WhatsApp as separate companies. He is promising to transform Facebook from a company known for devouring the personal information shared by its users to one that gives people more ways to communicate in truly private fashion, with their intimate thoughts and pictures shielded by encryption in ways that Facebook itself can't read. (AP Photo/Elise Amendola, File)