The Russian Internet company, which earlier invested in Facebook, is offering to buy 100 million dollars worth of stock from Facebook employees. This deal values the social networking site at 6.5 billion dollars.

The Russian company, Digital Sky Technologies (DST), has already invested 200 million dollars in Facebook in May. Now it is offering 14.77 dollars per share of Facebook common stock. Jennifer Gill, a DST spokeswoman, mentioned that the tender offer will close “some time in August.”

“While individuals must make their own decisions about participating in this program, I’m pleased that the price DST is offering is much greater than the price originally considered last fall,” Facebook chief executive Mark Zuckerberg said in a statement.

Technology blog BoomTown reported that current and former Facebook employees can sell up to 20 percent of their common shares.

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