How much is your Facebook page worth to Facebook? Probably a few hundred dollars, according to a Facebook app, Viral Loop, that’s collecting data as it is promoting a book of the same name. How much are celebrities’ pages worth? For many, hundreds of thousands, if not millions, of dollars.

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Last night while Nadal was changing his shirt after his match a man ran out on court and hugged him. The way it was filmed it looked like it was a family member or something (and I think Nadal thought maybe it was too, the way he initially reacted) and then two security people pulled the guy away and I felt really uncomfortable because everyone’s good naturedly comparing it to the time a gremlin pranced out and shook up Federer but what I thought of was the time a guy lunged out and stabbed Monica Seles.