There is plenty of speculation around that Facebook is preparing for an IPO, which has been fueled by Facebook advertising for a Stock Administration Manager.

In addition, Mark Zuckerberg’s sister Randi Jayne, who also works for Facebook, has recorded a video trashing the competition. That this has been taken down at Facebook’s request has added to the IPO speculation.

Facebook recently hired Chamath Palihapitiya, who was a senior marketing executive at AOL, but the advert for a Stock Administration Manager and its reference to SEC rules which cover public listings suggests the company is considering an IPO.

Meanwhile, Valleywag reports that Facebook has taken down videos of ‘Valleyfreude’, a song by Zuckerberg’s sister which mocks Friendster and brags that the site rejected a $1bn buyout offer from Yahoo.

The theory is that Facebook is reluctant to cause any problems in advance of a possible IPO, just as an interview given to Playboy by Larry Page and Sergey Brin caused trouble for Google before it floated.

Facebook is growing rapidly this year, recent figures showed that the social network has grown its UK audience by 2123% from May last year, and that it is growing at a faster rate than rival MySpace.

What seems clear, is that Zuckerberg isn’t in this just for the money, otherwise surely he’d have sold to Yahoo. He knows Facebook has yet to peak.

Still, we can’t help but wonder when Mr Murdoch will make him an offer he shouldn’t refuse…