Pine, I think it is a good idea. But there are some spams that are subtle, so that a better understand of the local language would be necessary - a business page, like a bar or restaurant, in a neighborhood. I am sure lots of spam would be detectable even not knowing the local language, but not all of them.
A little off topic, but today I read a theread on a mailing list where a professor very commited to open education resources (he uses CC-by) is now complaining about the bad use of his educational content by spammers:
Damn. How can we solve that? :(