Hi Gerry,
Except if some users have expressed concerns about being "stalked" as you put it, then I'd suggest you spare yourself the development time and let each user decide if it's useful to him.
Otherwise, I guess an easy way to disable it would be to add an interceptor in from of the "subscriptionService" to disable the "follow" function.
Then you might want to write a short script to unfollow all the users who might already follow someone else.
Finally, you may want to tweak a bit the UI to remove the follow button and the following/followers tabs in the users profile