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Doesn't Facebook do something similar for preview links in chat and/or wall posts? You're probably limited by the number of messages/posts, but I wonder if that could be exploited with n number of fb accounts.

Yes, the same to Twitter. When you paste any links into your tweets, a Tweet Bot will crawl the link to show preview information.

There are reports skype does it to.

Don't want to disclose anything at this point but at least one other huge bandwidth owner suffers from this type of attack. Combined, it is clearly a disaster for any small-medium business.

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