Great question! Like many of the others I leave fan mail whenever I see something that inspires me. I leave it to new hubbers because I think it will serve to welcome and encourage. Hubpages platform allows for thoughtful communication between hubbers and I personally think it is great. We all (writers) have a passion or a goal and when we get feedback and encouragement it helps us not give up. Writers, like actors, often have little insecurities that we are trying to run from or hide from the world. Some of us are better than others but the passion for what we do is still there and is still valid.
I also will send a personal note to a hubber via the contact through hubpages if I miss seeing someone for a time. Want them to know I miss them and I thinking of them..... just me.