Is there a way to follow people’s activity?
Is it like how we're favorite a question here for further reference. It's kind of twitter functionality that, the users, I'm following will get tweets from them, it should be same like star under each question, same star option in individual user profile.
If I'm favoriting particular user, the questions asked by him/her will be visible as new question feed, so if its of my knowledge I can give reply back right away. For privacy, community can't show whom are following us, instead show a count number of users following us. To remove a favorite we can simply go to their profile and make it unfavorite in case.