"This lets all of our clients do everything they need to do on the two largest social platforms—Facebook and Twitter—so in the social ad battles instead of going in with a water gun, you can go in with an army," he said.
Bottom line: Lazerow said advertisers will be able to buy ads on Twitter much easier.
"You'll be able to test easier, scale easier, you'll be able to manage your campaigns at scale, I think it'll be really big for them," he said. It's also potentially big for Salesforce, which makes more money the more people spend on its platform.
(Read More: Facebook vs. Twitter, Who Has Edge in Mobile Ad Wars?)
Facebook's launch of an ad API made a huge difference for its business. eMarketer estimates that roughly 60 percent of Facebook's 2011 and 2012 ad revenues came from API-based buys. eMarketer said that Twitter has been growing fast.
Though the private company doesn't release any financial data, the measurement firm projects Twitter's revenue will grow 90 percent this year to $545 million, and that next year it will earn more than $800 million in global ad revenue.
—By CNBC's Julia Boorstin; Follow her on Twitter: @JBoorstin