It's not as extreme as that--consider just the case where you want to share things with work friends that might not appeal to college friends. You're not acting

It's not as extreme as that--consider just the case where you want to share things with work friends that might not appeal to college friends. You're not acting different; you'd show the college friends if any of them asked, but you know they're bored by it so you want to keep it out of the timeline/tweets/whatev that they see.