Nokia last week acquired Plum, a small company that created a platform for private social networks in a move seen as part of its transformation from wireless device maker to mobile service provider.

"Plum will complement Nokia's Social Location services. The acquired Plum assets will become part of Nokia's Services unit," is all Nokia (NYSE:NOK) said in a brief statement issued today that did not disclose financial terms.

The company, which employs less than a dozen people in San Francisco and Boston, will continue to "operate unchanged," said Plum founder Hans Peter in a blog post.

Plum's software allows small groups to create private social networks, sharing links, photos and updates. It also licenses the platform to other companies and Web sites who employ it under their own branding.

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