Need Advice: Facebook Like Button to like a subsite

i'm struggling around for days now ...this is the scenario:

a user can upload a pic an开发者_开发技巧d add some text on the site. After that, he/she gets a link that leads to his created content. I want the user not only to share his content with the link, but also on facebook with specified image and text. Tried this with open graph tags, but it is bad changing those tags dynamicly before liking because fb caches that info and does not recognize specific changes ... but correct me if i'm wrong ...

The problem seems to be, that when the user clicks on the like button, the content to share is not the actual site, but the subsite with its content ...

How would you do this? Thanks for any advice!

I think you are looking for something like this:

facebook like: href url vs. canonical url

doing it with the fbjs sdk was the right hint ... now it works perfektly and individual ...