RG has given the options to Recommend, Follow, & Share but some members prefer to follow by comments like following, nice question, interesting etc etc. I couldn't understand the reason, please share your opinion.
I suppose the reason is the impact registered answers have on your RG score. I also noticed that and to me it is a little bit annoying. If you do not have anything to say why just acknowledge that you are present?
I click 'recommend' and 'follow' after I read/quote other scholars paper/journal to acknowledge their work and it is politely means I thank you to them for sharing the ideas/information plus I wanted to know what on their next research for me to keep learning. Except for those doesn't wish their paper to be acknowledged via Research Gate.