friendfeed Facebook paid $50 million in cash and stock to buy social sharing site FriendFeed today, according to The Wall Street Journal.

The newspaper reported: “The company paid roughly $15 million in cash, with the rest in Facebook stock that vests over several years and would be worth roughly $32.5 million based on the $6.5 billion common valuation an investor recently placed on the company.”

FriendFeed last raised money in 2008 with $5 million from Benchmark Capital and Paul Buchheit and Sanjeev Singh, two of the founders. Neither company would reveal the financial terms of the deal in interviews today.

Facebook’s $6.5 billion valuation comes from Russia’s Digital Sky Technologies’ offer to buy employee stock last month.

Here are the files from the company’s Series A last year: