There may be a blog on a LT multi blog site that you like. You would like to let others know you like it.
On the blog you like, there is a section on the right side column that says Followers and Follow this Blog. If you click the 'Follow this Blog' link, your username with a link to your blog is listed in the Followers section.
Along with the above, you are notified whenever the blog you are following has a post.