If you're a regular Twitter user, by now you're probably used to seeing "promoted tweets"—paid tweets from accounts you don't follow—pop up in your timeline. Today, Twitter announced that you'll start seeing "promoted accounts" start showing up there, too.
Promoted accounts are basically ads that prompt users to follow accounts for businesses or brands, and that make it easy by including a "follow" button directly in the post. Until today, Twitter only displayed promoted-account ads in the left-hand column of the Twitter website and in the "Discover" tab on mobile. Twitter's latest update will put the promoted accounts directly in the main timeline on your mobile device.