One of the most popular micro-blogging sites in the world is now looking to profit from its services.

Twitter recently changed their terms of service to possibly allow advertising on their website. Biz Stone, the founder of Twitter, said they are leaving the door open for advertising and that they’d like to keep their options open. Twitter remains conscientious about annoying their rapidly growing user base with tons of ads.

With a user base of over 45 million and still rapidly growing, it’s difficult to resist the revenue that can be generated from advertising. However, there are some potential problems facing advertisers on Twitter. The content on Twitter may create branding issues for advertisers as the quality, validity and potential offensiveness of user posts may thwart their attempts to create positive brand associations.

Twitter’s new terms have opened the door for “targeted advertising,” but they have yet to deploy any such ads to their users.

For more information check out what Twitter has to say on their Blog.