My (limited) online presence

I have a large Linkedin presence, which I keep up-to-date quite carefully, and I visit Linkedin almost daily. There are lots of UM and UM-D posts to like and comment on! I do not have, and am trying to avoid having, a Facebook account. I have a twitter account, but have fallen into the pattern of hardly ever checking it. I am very active on Quora, and much of this activity is answering questions on probability and statistics (my field); sometimes I feel uneasy that I’m “doing a student’s homework.”