Add a Follow button to Q and A question

I'm using the Q&A plugin with BuddyPress and want to put a 'Follow' button next to each question and then when the user follows the question it and any answers to that questions will be put into that users Activity feed. The item put in the feed will be a link as well that when clicked will go to the question on its own page.

Thanks for any guidance or help about how to achieve this.

Sam Griffith