Dive summary: 

• Twitter announced the launch of its advertising API to the elation of brands and marketers who will now be able to manage Twitter ads from the same systems used to manage social listening, social content and social ads for other networks.
• The addition of an ad API makes Twitter one of the only global social networks, the other two being Facebook and LinkedIn, to allow marketers to create, manage and optimize ads. 
• This e-launch is for Twitter's Promoted Accounts and Promoted Tweets only and Twitter will continue to handle Promoted Trend exclusively. 

From the article:

"These powerful APIs creates "win-win" situations for everyone. Facebook and Twitter benefit by outsourcing much of their product development in this area to experts focused exclusively on building these products. Marketers benefit by using the technology to be more efficient and drive more ROI. Most importantly, by promoting content on Twitter and Facebook that your users are actually engaging with the most, the users of these important platforms get less crappy ads than pretty much every other major web destination."