Sometimes I like to just stand to the side and watch and read. Not with popcorn; it's not a show, but with a notepad and pencil to catch all the interesting bits. For example, Psychochild's blog is often one to which I have no significant responses, but there's usually a good bit of discussion in the comments. Or lately a few of Tesh's posts, such as on balance, have gotten me thinking, but not saying.
It makes me wish there was a like, dislike, and "mutters thoughtfully" button on all posts.