Facebook netted a $6.5 billion (€4.64 billion) valuation for its common shares earlier this week, further underscoring the fast-growing internet social networking site's high rank among technology and media industry heavyweights.

Russia's Digital Sky Technologies said it will pay $14.77 a share for Facebook common stock, boosting its stake to as much as 3.5 per cent and valuing Facebook at about $6.5 billion.

While that is below the $10 billion valuation set by Digital Sky's May investment in Facebook, which was for preferred shares, investors have been valuing the social network's common stock at less than $5 billion in secondary markets in recent weeks.

The deal suggests that Facebook has a higher market value than many established media and tech companies which generate significantly more revenue than Facebook, including CBS Corp. and Salesforce.com, as at least one blog pointed out.

CBS, which had $13.95 billion in revenue last year, has a market capitalisation of $4.06 billion and Salesforce.com had a $4.72 billion market cap at Monday's market close.

Facebook is expected to breach $500 million in sales this year, according to board member Mark Andreessen. The company has said it expects revenue to grow 70 per cent this year.

At $6.5 billion, DST is valuing Facebook common shares at 13 times expected 2009 revenue, noted JMP Securities analyst Sameet Sinha, well above the 2.2x multiple that is common for online advertising-based businesses and even the nearly 6x multiple of Google Inc., the number one internet search engine in the US.

But Sinha said Facebook's lofty multiple was not completely out of line given the strong growth in sales and users that Facebook is generating amid a tough business environment.

"Those are the things that are really driving the valuation," Sameet Sinha said. "Essentially, people's expectations are that this could be the next Google."

Facebook recently surpassed 200 million active users on its social network, up from 100 million users less than a year earlier, and vaulting it ahead of rival social network MySpace which is owned by News Corp.

Digital Sky, a Russian investment firm, bought $200 million worth of preferred shares in Facebook in May and said it would buy another $100 million worth of common shares from Facebook employees and ex-employees.

A source familiar with the matter said that Digital Sky will pay $14.77 per common share. A representative for Digital Sky confirmed the terms, and said the tender offer runs through the rest of this month and August.

Digital Sky spokesman Jennifer Gill would not say whether Digital Sky would impose a cap on the amount of shares that participants can sell in the offer.

The firm plans to buy up to $100 million of Facebook common stock.

In a statement, Facebook CEO Mark Zuckerberg said he was pleased that the price that DST is offering is "much greater" than the price his company originally considered last autumn in a similar programme to allow employees to cash out their shares.

Facebook put that plan on hold as the financial markets tanked last year.

Facebook employees and ex-employees are eligible to participate in the offer, said Ms Gill, but she noted that Facebook senior management, board members and holders of five per cent or more of Facebook are not eligible due to legal reasons.

When Facebook initially attempted to create a programme for employees to sell shares last year, participants were limited to selling 20 per cent of their holdings, or $700,000, whichever was less, according to a former Facebook employee.

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