Well that assumes we have control over what others are doing. Take my situation for example. I am Nigerian but live in the UK. 99% of my family are in Nigeria and like 90% of my friends. In Nigeria every man, woman and dog is using blackberry because of blackberry messanger.
Now I have to carry two devices around. One for chatting and one for everything else. Oh how I wish Nokia had been the one that came up with this incredible chat.
Funny thing is the whole of Nigeria was using Nokias before they switched to blackberry just for messanger. Huge missed opportunity there by Nokia. I hate my blackberry though. Super ugly and super boring device. Now if some magician could make my blackberry chat appear on my N900 so I could dump the blackberry in a pit where it belongs I would be soooo happy.