Twitter is anticipated to pronounce its own photo service that could compete with Twitpic and Flickr.

According to several sources, Twitter is to open its own photo-sharing service to vie with existing services like Twitpic, Yfrog, Instagram and Flickr.

The pronouncement is anticipated this week at the D9 conference in California, where Dick Costolo, the chief executive of the company, will be speaking on Wednesday.

Techrunch, which first reported the plans, said the service perhaps would be provided by means of the website twimg.com, which Twitter has possessed since July 2010.

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