My wife is a private practice speech therapist. She goes to great lengths to separate her personal social media from work social media. She has separate work and personal accounts for Facebook, Google, WhatsApp etc. Still she gets friend suggestions for her clients on her personal accounts. And it's not just once or twice, usually her suggested friends list is almost the exact same as her current client list.

Its creepy, and slightly disturbing to realise just how much effort they are putting in to mapping out your life and acquaintances even when you try to prevent it.