Social "inter-networking" pioneer Power.com is formally unveiling its service today.

Social network users are able to synchronize their logins, content, messages and friends across social networks such as Facebook, Hi5, LinkedIn, MSN MySpace and Google's Orkut. On the surface the offering sounds a lot like Ping.fm, but a closer look reveals that Power.com focuses more on those within the network as opposed to messages on the network.

Users join by registering their social networks at Power.com. They are then able to see all of their friends, messages, and content -- from all their social networks, instant messengers, and email accounts -- in one place. Updates, pictures of friends, messages that they'd see on Facebook show up next to ones they have on MySpace, LinkedIn, etc. Communities, birthdays, any social network features they choose, are all arranged by people -- not by website -- on their Power.com start page.

"Today many people have multiple social network, email and IM accounts," said Steve Vachani, CEO of Power.com. "Power synchronizes their friends, messages, photos, updates, and everything they care about. We're taking down the boundaries between social sites, so users can keep in touch, and even synchronize friends and photos automatically. We call this Social Inter-networking."

In the near future, Power will support them on LinkedIn, Twitter, Flickr, Hotmail, Yahoo, Gmail, AOL, Skype and other email and communication accounts.