You can search the entire network (for any keywords or tags like these
) by using the global search box at the top right of every screen:
If you want to search for blogs, look for the tag list on the blogs page:
Selecting any tag will search for all blog posts with that tag. I believe this will only search blogs written by that author/member only. To search for any blogs (by anyone) using that tag, use the global search above. It's easier than it sounds.
You can search for any word, and you can search for tags. For a list of common tags see this page