As Facebook registered its 500 millionth member, the celebrities fear the growing link to sex crimes against children and underage abductions, Daily Express reported.
In one high-profile case in the US, a 48-year-old man allegedly kidnapped a 13-year-old girl after lying about his age online and asking her to go out on a 'date'.
"I'm urging kids, don't go on the internet. It's not fun; it's dangerous," said teen sensation Miley Cyrus, a former 'web addict'.
Some of the celebrities are also enraged over bogus home pages in their names.
"I would rather have a prostate exam on live television by a guy with very cold hands than have a Facebook page," said Clooney.
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