Don’t misunderstand the title. I am not saying that Twitter is used by tools, rather it should include access to tools as part of its eventual revenue model. Despite the belief that Twitter should begin incorporating ads into their framework, Twitter is likely going to take a more practical approach. Tools.
By going with a Twitter tools approach, Twitter is trying to emulate Google’s approach to not annoying its users. While Google does use ads, they made sure early on that it would be done in such a manner as to not irritate the user. Same goes with Twitter, as the tools approach would be for the benefit of the pro level user while making sure to not fill limited screen real-estate with ads that would most likely be irrelevant.