“Promoted” seems to be Twitters favorite word as they graduate from Promoted Tweets to Promoted Trends to the newest item, Promoted Accounts.
Promoted Accounts will appear in the Suggested For You space in your Twitter sidebar. The algorithm is set to compare your followers with the followers of people you follow, then suggest an applicable Promoted Account that you aren’t already following.
Who’s on first, What’s on second and I Don’t Know is definitely on third. Twitter simplifies it with this example: