I only just realised we are 3 days into Social Media Week, an initiative involving 12 cities worldwide. As well as a lot of twittering etc. there are many events being livestreamed, and since the cities are scattered around the globe, there is something going on at most times of day.
Home page: http://socialmediaweek.org/
Livestream video http://www.livestream.com/socialmediaweek
This is the Tagxedo picture created from Social Media week's Twitter identity, it seemed the thing to do