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>> Molly: Have you noticed a lot of celebrities on Facebook lately? Maybe you didn't realize you were friends with Sandra Bullock. It's the latest trend on the social networking site. Find your celebrity dopple ganger. Now, dopple ganger means look alike so Facebook users have been switching their pictures to the celebrities they think they resemble the most. It's just the latest fun fad to take over the social networking site. And now some users are going to urbandictionary.com searching for their first names and posting the definition as their status update. So how can you keep up with the latest fun Facebook fads? Well, pay attention to what your friends are doing. If you see everyone's picture start to change or their status updates going funny something's going on. One thing to watch out for with fads like celebrity dopple ganger it's not actually legal to use someone else's photo of a famous person as your profile picture. Also, be aware that companies might be using these fads to get attention. The urban dictionary status updates craze was started by urban dictionary. So decide for yourself whether you want to use your status update as ad space. And if you've got a good idea for a home-grown Facebook fad, well, just send out the instructions to all your friends. If it's fun enough you might be the inventor of the next Facebook craze. For CBS News I'm Molly Wood, CNET.com in San Francisco.
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