Please guys i need my Twitter account it's more than 20K, and i didn't do any illigal things .. I need your help, Can you ?
If it appears when you posting manually, then you should contact support. In the other hand you probably have an app that posting in a bad way. You should stop it otherwise you risk your account.
Post to Twitter via mobile device, Twitter.com and Hootsuite -- never saw that message. You are probably using or doing something you shouldn't be.