Knocking, an application that shares live video footage from your iPhone or Android camera, said today that it now has 2 million users.

The Knocking app first launched on iPhones in December, then added Android in March. So (to offer two random examples that Knocking-maker Pointy Heads Software gave me when the app launched) you could show your spouse video footage of a product that you want to buy while you’re at the store, or show your coworkers the great view while you’re on vacation.

Knocking had a splashy release in December, hitting number three in the app store’s social networking category and drawing in so many users that the app stalled for several hours. The user numbers (Knocking is a top 20 social networking app on the iPhone, and top 10 on Android) suggest continued popularity. At the same time, the novelty may be wearing off, especially with Apple releasing live video capabilities through its FaceTime video calling application.

Knocking has the advantage of allowing video sharing between Android and iPhone devices. And the company said it plans to expand its capabilities soon so that it’s not just about sharing video with your friends. It will add “one-to-many” video sharing, so that you could follow video from celebrities, brands, and more.

Knocking has also just added a number of board members who can help with this strategy, including former Sony and Virgin records executive Ty Braswell; David Honig, an early investor in Aviary, UrbanDaddy, and Fafarazzi; and media entrepreneur Suren Pai.

Pointy Heads is self-funded and based in Danbury, Conn.