unfortunately all twitter did was make famous people appear likeable and personally engaging to their fans by sharing their daily mini-blog, while also not too subtely plugging all their music/movies/books in super real time. Becase you see lady gaga say some random shit, it makes it feel to the masses like she gives a damn about her fans.
Theres nothing wrong with it for us making one when our update schedule is higher than now. However, I think steam user group is a much more tailored way to involve the community in our progress. Each time we have updates either PR or game content, we use the Goldeneye: Source steam group announcement system to inform all the people who have chosen to be counted a diehard fan of the project.
http://steamcommunity.com/groups/goldeneye <-- our twitter, get on it babydolls