You can add one more thing: inane bullshit. In my field of academia, I know several people who maintain a Wordpress or similar blog for serious matters, but a p

You can add one more thing: inane bullshit. In my field of academia, I know several people who maintain a Wordpress or similar blog for serious matters, but a parallel Tumblr blog for silly memes etc. So, there seems to be a feeling among some that Tumblr is not a credible venue.