Well the deep integration we all want is apparently coming in BlackBerry 10 along with what looks like an all white BlackBerry 10 device! The leaked slides show the Facebook and Twitter application running on the BlackBerry 10 device.
The Twitter application shows off refresh, timeline gaps, conversation view for details and a lot more! As for the Facebook application the UI is very clean and standard as you would see in a normal Facebook app.
Via: CB Forums