Dive summary:

• Twitter recently announced a new targeting option for marketers: targeting based on interests.
• Before, businesses could advertise on Twitter based on recent search terms, but this new capability will allow marketers more insight into their audiences' interests.
• Twitter also announced the option of targeting by username, meaning that it will advertise to those usernames similar to the one selected.

From the article:

Last week, Twitter launched a new update to their promoted tweets that should get marketers pretty pumped. Now, you can target your promoted tweets to users based on their interests. Pretty groovy, eh?

Before this launch, people were able to promote tweets in timelines, search results and profiles. Targeting a specific search term, however, was the only way an advertiser could control who saw their tweets. That left the rest of their promoted tweets to be targeted to "followers," "people like my followers," or everyone. No more! Now Twitter advertisers can show promoted posts. ...