) -- Julian Assange is a trending topic on Yahoo! This morning after the founder of WikiLeaks told

The Sunday Times of London

that he will release an autobiography next year.

"I don't want to write this book, but I have to," Assange told the newspaper. He said he has already spent £200,000, or $308,000, on legal costs. "I need to defend myself and to keep WikiLeaks afloat."

Assange said he struck an $800,000 deal with New York publishing house Alfred A. Knopf of Random House and a $500,000 deal with Canongate books in Britain.

Hugh Hefner is a hot search topic today after the Playboy founder announced he is engaged to a Playmate.

Playboy founder Hugh Hefner

Hefner, 84, announced his engagement to 24-year-old Crystal Harris via Twitter on Christmas morning. This will be his third marriage.

>> Playboy Upgraded on Hef's Purchase Power



shares spiked last Wednesday after Caris analyst David Miller upgraded the company to above average from average, and raised his price target to $6.50 from $5 on beliefs that Hefner has the means to take the company private.

The chatter on Main Street (a.k.a. Google) is always of interest to investors on Wall Street. Thus, each day, TheStreet compiles the stories that are trending on Google, and highlights the news that could make stocks move.

-- Written by Theresa McCabe in Boston.

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