Twitter users can’t control the frequency of the tweets
The user sees the tweet mixed by Twitter’s algorithm. Sometimes a single user that they follow could tweet 5 times in short amount of time especially those news portal. The frequency of certain users are not clear.
Although the “See less often” is available, yet the user can’t get wholistic picture.
A scale appears after the user hits the follow button. The user is able customized how frequent the tweets will be in the future.
In the profile page, the user could see the follow rate of each person that they followed.