How to add followers to Contacts within Tasks

How to add followers to Contacts within Tasks

Hi
I've seen that the Contact pane of a Task shows a Follower count. However, clicking on it does nothing, and I can't see a way to add myself (or anyone else) as a follower to a contact. 

Is there a way to add oneself as a follower to a Contact record?

I'm assuming that being a Follower means you get to see updates for that contact (tickets, Deals, Projects etc)  ?

Olly