"If someone thinks you add enough value to warrant addition to their contacts, thank the person who adds you. If you’re not following the person who added you, give them a follow and then, once they follow you back, DM them a quick thank-you note. I disagree. If you add me to a list, I’m not going to follow you. Rather, I may follow your list especially if there are others on the list new to me. You also assume if I follow you, you will reciprocate." - Ari Herzog