How a user can mark a post as a Spam

I want a Button like "Mark as Spam" on Blog Posts, Forums etc... Like when a user is reading a blog and he/she finds it as a Spam. They Should have the button to mark it as a Spam. Please let me know how can I do that.

Thanks

There is a Report Tool module for reporting Spamming, Abuse etc. see http://www.boonex.com/m/reporting-tool