Personally I never understood people obsession with broadcasting where they are and what they are doing any given moment; probably this is the reason why I avoid FB and similar programs.
Regardless MS should focus its resources toward adding very much needed features to the OS; some quick example:
A decent, working, usable "Calendar": Week view, an usable Month view etc.
The option to sync with a desktop!!!!
Without getting in the debate about how updates are made available to users the simple fact that the next update called "mango" will not be available before "sometimes before the end of the year" is, at least for me, unacceptable. I am almost ready to go to Ebay and buy a HTC HD2, actually buy again a HD2; I had it and I really miss its functionalities. I will surely miss the graphic interface of my WP7 device but.... I need functionality more than aesthetic.