What to expect from Facebook's biggest event of the year

Get ready for all sorts of updates and announcements from Facebook. The social network kicks off its annual developers' conference, F8, on Tuesday and the biggest topics on the agenda will likely be Messenger and video. Since Facebook first started letting businesses integrate with its chat app, Messenger, at last year's conference, it has continued to give companies more ways to use it to communicate with potential customers. Facebook's thesis is that some people hate talking on the phone and would rather do something -- buy a shirt, order an Uber, make a dinner reservation, check their flight status -- within a chat interface. So, it wants to turn Messenger into a full-on platform for retrieving information and getting things done through natural-seeming conversations with businesses.