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I run a giant community. Many spammers will use link shorteners or .tk domains that 301 to their spam offer. How are sites detecting the final domain and is this a viable solution to block spam?

ex. I'll just block the spam: bit.ly/xdfd but then they will just use a different shortened link.

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Building off what @Baptiste said, you might mention what forum/CMS/etc you're using as there could be a feature or plugin of some kind that'll handle this for you. –  Su' Sep 14 '12 at 10:38
    
it's a custom site. j0k gave me some good ideas, thanks –  surpr Sep 15 '12 at 19:08
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2 Answers

Many forums simply forbid all url shorteners. There is no simple solution to that, you may try also specific solutions for your platform (phpBB, vBulletin, etc.)

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There is plenty solutions to expand short url:

When user submit a new post, you can apply a function that expand url for all url inside the post. Then you will have the real url. So you can appy what ever spam solution you use to reject / accept the post.

You can also replace the shorten url by the full one to avoid short link on your commutiy board.

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