'Flag as inappropriate' notification system - is there a gem or plugin for Rails?

I wo开发者_StackOverflow社区uld like to implement a 'flag as inappropriate/abusive' notification system for my app, whereby users can click an icon or link if they think a post/comment is inappropriate, and a notification email is then sent to the site admin. Are there any gems/plugins for this kind of functionality (Rails 3)? Or if I need to roll my own, would using a taggable gem (eg. acts_as_taggable or similar) be suitable for this purpose? Thanks for the help!

You can use the can_flag plugin.