Pinterest could be worth over $7 billion

>>> in the fast-moving world of social networking , there is a new place to be, pinterest has become the third biggest site behind facebook and twitter and growing seemingly out of nowhere. our report tonight from kristen dahlgren.

>> jenny jackson could be a poster child for pinterest.

>> it became an obsession.

>> she used the pinboard for everything from recipes to decorating ideas.

>> i think a good way to describe it is it's folders of things you collect and do and want to do, inspirations.

>> she was recently inspired to form a group with other fanatics to try out their pinned projects.

>> that looks great. i'm going to take a picture. pinned.

>> the growth has been phenomenal. from 3.3 million users to almost 19 million in just six months. making it one of the fastest growing internet companies ever.

>> with millions of visitors and all of those images, you might expect pinterest to have a huge high-tech headquarters. you would be wrong. this is it, a small, quiet room in paulo alto with about 30 employees.

>> as a kid, i was really into nature and really into science.

>> ben silverman was a bug collector as a child with an idea to take collecting online. it paid off. forbes recently estimated the two-year-old company could be worth over $7 billion.

>> pintrust has the women and the buyers. they have the money, right? and they have them in huge numbers. and these people are addicted.

>> the perfect target for companies. 85% of pinterest page views are from women, most between the age of 21 and 34. from the midwest, and households that earn more than $74,000 a year. everyone wants a piece of the pinning. osku oscuker derulenta pinned his life show, and so does "nightly news."

>> we want something we were really proud of, something that was beautiful and useful.

>> it looks awesome.

>> in doing that, the new internet darling with a funny name may have just hit the bull's eye. kristen dahlgren, nbc news, pallo alto, california.