Tiny Pictures likes to say your mobile phone is your social network.

That's because its Radar application for mobile phones and computers lets groups of friends share photos and videos, and then comment back and forth.

Already the service has 1.2 million users, John Poisson, founder and CEO, said Tuesday, up from 750,000 in February.

Poisson said new features are coming to Radar by the end of September that will permit users to subscribe to channels and receive content, such as trailers and footage from new movies.

The company also may seek some more venture money, though no specific plans are in place, he said. Tiny Pictures raised $7.2 million from Draper Fisher Jervetson and Mohr Davidow Ventures in February.

By Mark Boslet, Editor at Large.