BuddyPress.org

Hello,
Is there a plugin to favorite a blog post:
-one can favorite a blog post
-one can see and edit his/her own favorites
-one can see the favorite blog posts from another member
-favorite blog posts will show up in someones activity
-a widget/page shows the most favorites blog posts

Is there something like the above? If not, can someone create such a plugin for me and how much will that cost?

Thanks, Robbert