The micro-blogging service has launched a series of ads promoting its own range of services, including widgets and its new search functionality.
The in-house ads appear as a text box in the top right hand corner of on a user's profile page.
It is not known whether Twitter has plans to roll out the ad format to third-party advertisers.
Despite the growing number of brands using Twitter, the service has yet to launch a commercial model, instead securing funding through venture capital investment.
A fee-based service for companies who wish to use Twitter has also been mooted as a possible way to squeeze cash out of users.
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