Hello, I'm setting up a Buddypress social network. The thing I need is this: I will have a custom field, where users can input their interests. When someone posts a @mention with one, or more of other users interests, that post should show in the activity stream of users who have the interest in their profiles. Is this possible? Also, is there a way for profiles of non-paying users not to be visible to others, and those who are paying can be visible to everyone? Thanks, best regards.