The life stream is really just the small talk of the social network. It's not particularly interesting but it enables the next step. Communities of practice and group action do rely on people syncing up their interests first.
textmate is appealing because it always had a great default configuration. For many people getting old-school editors to play well required too much config ninjaing.
I was great this is awesome then I watched their promo video and have to say I feel I just ate way too much cake. I feel ill now. Wow this is bad. I am just not used to this kind of shit anymore after years of watching everything commercial-free on the internet.