These are all workaround solutions, but the Facebook suggestion really is a cheap and very very efficient way to eliminate spam. Otherwise sites like yours and ours will always be attractive to spammers.
Originally Posted by faria18000
I like the idea of only accepting Facebook registrations (even prefer it over Twitter accounts).
You may want to try adding non-latin characters used by foreign languages to your spam trigger lists as a way to prevent those posts. For example characters, look through the /languages/translit.txt file.
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