Personally I 'd appreciate smart watches having gps/sports functions than any social media enabled functions.
I can imagine someone waiting at the traffic signal wanting to tweet a hurried message to someone without having to whip out his smart phone, seems rather silly, while getting a notification/sms on a smart watch may not be a bad idea, the act of input via touch is difficult, speech input is more easier.
can you imagine hordes of people with their wrists glued to their faces?
I can see that happening in Singapore.