Tiger Woods may be one of the most famous people in the world but he's the greatest disappointment in celebrity product endorsements --- this, according to a recent study commissioned by the trade publication, Ad Age.

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In the study which focuses on celebrity endorsements, Ad Age found that Tiger was the least effective endorser during 2010.

The study closely monitored the impact of all nationally televised ads for the better part of 2010 and discovered "from Tiger Woods to Donald Trump, we found that with rare exception, celebrity endorsements were largely ineffective and failed to yield the benefits popular wisdom promises."

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People are "more likely to be influenced by someone in their social network than a weak celebrity connection," the study contends.

As RadarOnline.com previously reported, on Jan 6 the shamed golfer lost his 13-year endorsement deal with Golf Digest. Prior to loosing that, Tiger was also dropped by Proctor & Gamble, a company for which he promoted Gillette razors and shaving products.

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Also out the door in 2010 -- along with his now ex-wife Elin Nordegren -- endorsement deals with Gatorade, GM and AT&T.

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Tiger Woods sat courtside at the Orlando Magic basketball game Christmas, while ex-wife Elin Nordegren and their two children spent the holidays in Sweden, RadarOnline.com has learned.

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Tiger was spotted cheering for his favorite team as they beat the Boston Celtics 86-78, snapping Boston's 14 game winning streak.

This may lift Tiger's spirits a bit.  On Thursday the golfer was dropped by Proctor & Gamble, which used Tiger to promote its Gillette razors and shaving products.

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As RadarOnline.com previously reported, Elin and their two children, daughter Sam, 3, and son Charlie, 1, went to her native Sweden for the holidays.

Elin wanted to spend Christmas with her politician mother Barbro Holmberg and other members of her family.

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Tiger isn't just missing Christmas with his kids, he also won't be there for his son's 2nd birthday February 8.  Woods has already committed to playing tournament in the Dubai Desert Classic February 7-13.

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During his infamous April public confessional/press conference, Tiger revealed what he missed most during his time in rehab after his secret cheating life was exposed.

"Because of the time frame of it, I missed my son's first birthday and that hurts. That hurts a lot and I vowed I'd never miss another one after that," he said.

About that vow....

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Is it real or fake?

That’s the Internet buzz currently surrounding tennis ace Roger Federer’s amazing ‘William Tell style’ trick shot.

Watch the video on RadarOnline.com

So, RadarOnline.com would like you to judge as the world’s top player is seen smashing a metal can off a man’s head, not once, but twice with a serve while shooting a commercial for Gillette.