Beliefnet, the spirituality site bought by News Corp. in late 2007, is being shopped around for sale, according to several sources.

Sources said that the media giant is also considering selling off Berlin-based Jamba/Jamster, a mobile content provider now called Fox Mobile Group. News Corp. (NWS) paid $187.5 million to VeriSign (VRSN) for a 51 percent stake in Jamba in 2006 and bought the rest in 2008.

Founded by Steve Waldman and Robert Nylen in 1999, Beliefnet is a social networking site focused on religious, spiritual and faith-based issues, with $7 million in venture funding from Softbank Capital, as well as an initial angel investor round.

While its users skew Christian, the site offers blogs, news and other services related to Islam, Judaism and many other faiths, in addition to Christianity.

Its motto: “Our mission is to help people like you find, and walk, a spiritual path that will bring comfort, hope, clarity, strength, and happiness.”

The site was bought for an undisclosed sum by News Corp.’s Fox Entertainment Group as part of the Fox Digital Media unit. The digital strategy was to distribute some of its religious-based content on Beliefnet.

News Corp. has recently sold off some of the digital purchases it had made several years ago, such as its Rotten Tomatoes site to Flixster in a stock-trading deal.

Interestingly, Beliefnet’s Waldman is now senior adviser on the future of media and information technology to Federal Communications Commission Chairman Julius Genachowski.

Jamba was founded by Germany’s Samwer Brothers. On its Web site, News Corp. said it eventually bought it out entirely and “aligned the company’s business strengths with the global market opportunities in mobile entertainment, enabling it to underline its leadership in mobile content distribution, licensing and production as well as offering its customer a broad and up-to-date portfolio of mobile entertainment content further on.”

A News Corp. spokeswoman declined to comment on either Beliefnet or Jamba.

Reached for comment, Facebook spokesperson Brandee Barker offered up the boilerplate no comment: “Facebook is a private company, so as a matter of policy, we don’t typically share details about our financial plans or comment on rumor and speculation.”

But everyone else has been speculating about the value that Facebook and outside investors place on the company, and whether Facebook needs to raise any money at all.

We do know that in 2007, Microsoft (MSFT) beat out Google (GOOG) for the right to invest some $250 million in the Facebook, placing a $15 billion valuation on the company’s preferred stock. Preferred stock is typically more expensive than common stock because it gives owners the ability to recoup their money before other investors. Facebook later raised another $60 million from Hong Kong billionaire Li Ka-shing and $10 million or so from the Samwer brothers of Germany.

And various reports have suggested that employees and others who own Facebook common stock have been recently selling it on the private market for prices that value the company in the $4 billion range.

Facebook has repeatedly said that it doesn’t need additional cash to keep going and that it expects to generate $500 million in revenue this year and begin breaking even in 2010. Last year, the company felt flush enough to offer to buy Twitter for $500 million–$100 million of which would have been in cash.

The Samwer brothers of Germany have agreed to invest $10 million to $15 million in the hot social-networking site, a development which was first reported by Reuters and TechCrunch.

It feels like an awfully small amount to garner a key Facebook relationship in the important European market, so I would expect more to come.

A lot of people have doubted Facebook’s ability to raise more money after getting a lofty $15 billion valuation following a $240 million investment from Microsoft in October of 2007, which made the stakes very high.

And, indeed, the personal investment by the well-known European entrepreneurs comes after some time has passed since the last investment in Facebook in late November by Chinese investor Li Ka-shing of $60 million and possibly $60 million more, which was first reported here.

By coincidence, after meeting him at a dinner hosted by Accel Partners–a Facebook investor, in fact–in London in December, I am planning to visit with Marc Samwer next week in Berlin. Marc, with his brothers Alexander and Oliver, founded a German online auction site that was later sold to eBay and now run the European Founders Fund.

So, as they say over there: Ausgezeichnet!