Experimented searching for sites and blogs on topics in Technorati. Advanced search is a better option than a general search. Can search for a specific phrase (exact words) with additional options of searching "All blogs" or "Blogs about" to further narrow the search. Just searching in the Tags option also refines a search.
Once a set is displayed there is the option of viewing posts, blogs, videos or pictures mentioning the search term(s). A wide range of social networking sites can therefore be searched at one time, primarily through use of tagging for blogs, blog posts, images etc.
Examples of one search:
A search for Australian Rules Football (exact phrase and all blogs) produced 200 posts, 10 blogs, 20 videos and photos galore.
Entering "Australian Rules Football" in the Tag Search box produced 15 posts, 10 blogs, 20 videos and photos galore.