I'm talking about Twitter. It really is a cool system. I joined this week and I've been tweeting about my own stuff - blog updates and the like.
However, I'm following a good few marketing people and already I'm fed up with receiving tweets with affiliate links very thinly (well, they've only got 130 characters!) disguised as nuggets of marketing know-how.
Thank goodness it's easy to un-follow these people so I'm hoping market forces will prevail!