1. I did comment on a post. http://scienceblogs.com/ has a lot of blogs for science. This is a great clearinghouse for science blogs.
2. I think building the online community was fairly easy. Participating in the online community will take time to think of how to best blog. Thoughts must be concise yet detailed enough to provide others enough information on which others will be able to provide comments. It is easier to communicate with using a blog because you can post without having others close. They can post comments at anytime back to you.
3. I want to visit the following blog more often. http://nstacommunities.org/blog/ It has a lot of science information to offer as well as links to others in science.