People have been impersonating a number of widely followed accounts. For example I saw someone had at least briefly impersonated an account @muellershewrote with name "Mueller, She Wrote" which is owned by Allison Gill, along with the website muellershewrote.com and it is a Twitter account followed by about half a million accounts.
The impersonator used @mueiiershewrote but then also used the name "Mueller, She Wrote" so it was easy at first not to notice the actual Twitter account name was wrong. The post I saw seemed a bit off from usual fare from the real account... and then I noticed the account only had 50 followers... Hmm I thought. Then I finally saw the Twitter account was not right. As of a couple hours ago the fake account was still up but the legit owner of the real account has reported it and had urged others to do so.