What was the original reason for Twitter constraining the number of characters per tweet?

Where will promoted tweets show up for viewers you have targeted?

'Hard Selling' works effectively on Twitter.

What does Twitter's blue advertising follower meter display?

What are Twitter chats?

Which does not appear when someone views your profile on mobile?

This question is based upon the figure shown belwo: Which is the use of the image given above in Twitter?

Which steps is used to turn off the feature that lets the Twitter users find a user by its email address?

Do the following SMS commands perform the same actions: FOLLOW = ON and LEAVE = OFF.

In Twitter glossary, Tweeter is knows as _______________________.

Which is the correct method to report spam profile to Twitter?