BuddyPress

I would like to know how to implement bp functions in sidebar widget. Let say the author page where users can add the author as their friend or follow them. Its something like twitter sidebar where you can see how many friends and follows they have so far. Anyone?

Followers/Following is available as a plugin and has a widget to add ‘users following you’ to any sidebar/widget area. Friends is generally see on your account screen, doesn’t have a widget as such but it shouldn’t be hard to add the friends loop to a function in your functions.php file and to add it then to perhaps a sidebar-me hook to render on the sidebar.