I started using Twitter about year after its very early adoption and ended up investing in it around that same time. I'm involved with the Tech scene and companies ranging from Facebook, Stumbleupon and Twitter.
I lose all track of time on that level. I used to have a really good sense of time. I didn't need a clock to play, and I had a sense of when five, ten, twenty minutes had passed. Now I can only play with a clock.