Let us readers tag the content!
Can we comment a post? Why can't we tag that things too?
I'm developing a touristic's photos website and this function works great!!
Any user can see the photo and add any tag to the image.
Example: i added tags to reffer this TOPIC, maybe, someone read this and thing: "if this post was tagged with "some word" will be more easy to find it!
(Sorry for the poor english)