"I'm not even looking at my Twitter feed but I am looking at a particular hashtag of interest; someone has linked to a blogpost. I go to the blogpost, which has a link to another blogpost, where there is an interesting string of comments and… I've learned serendipitously. It was not my plan to follow that path, but hyperlinks made it possible"
" twXplorer, which allows you search for a specific hashtag or term, giving you the most recent 500 tweets along with some basic analysis of the content found therein."