If a user is temporarily locked out from trying to sign in after a limited number of failed attempts to sign in to Twitter, then after how much time the lock will clear?

Which factors Twitter takes into account when determining what conduct is considered to be spamming? 1. User's updates consist mainly of links, and not personal updates. 2. User has followed and unfollowed people in a short time period. 3. User posts misleading links. 4. User posts multiple unrelated updates to a topic using #.

Marketers can target based on all of the following EXCEPT:

What is RT used for?