Recently there are a lot of Spam posts on Meta.
- Why is Meta so "attractive"?
- What can we do to reduce Spam in the future?
closed as not constructive by kiamlaluno, Jim, Toon Krijthe, Wesley Murch, razlebe Aug 22 '12 at 13:35
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Its not the meta site who only has spammers. They are on every site.
To stop the spammer each site has a link called "flag" with each question,answer and comments. You only need to click on the flag and select the spam option. Flag privilege require only 15 reputation.
Update from sha wiz dow ard's comment : 6 spam flags will automatically delete the post and take 100 reputation away from the post author.
Note : flags are taken very seriously on each site.