I have visited the api-terms (below) but I am a bit unclear.
I’ve seen many websites that have users auto-follow them when the user authorizes their twitter application. Is this allowed? I realized we can’t (and shouldn’t) change their follower information in their profile otherwise.
"Get users’ permission before:
- sending Tweets or other messages on their behalf. A user authenticating through your application does not constitute consent to send a message.
- modifying their profile information or taking account actions (including following, unfollowing, and blocking) on their behalf"