I always wondered how much is in the interest of Twitter to get rid of fake accounts.
At the end of the day, the "Who to follow" box indicates that the more connections each node has, the better.
At the end of the day, the "Who to follow" box indicates that the more connections each node has, the better.
Mr. Eden there found out how to identify them quite nicely without having access to internal Twitter tech, so my guess is Twitter could have done the same, but hasn't. So I think the answer is, "not much."