I started in Twitter in March 2010. I did a lot, then my tweets sunk and since short I tweeted again.
My only discomfort in fact was the 140 character-rule.
Since yesterday I decided to leave Twitter as it is after a bit more than 13.000 tweets because I was very disappointed with their “help-system”: for the first time I asked a question about a problem with photo-loading and I got the, automated, answer: “Though we cannot respond to individual reports, the information provided helps us make Twitter better for everyone. We appreciate your help”.
Well, thanks a lot Twitter, you shall not miss me with 500.000.000 users!