Twemes

Twemes – “Twemes.com follows public Twitter.com tweets (messages) that have embedded tags that start with a # character. These are sometimes called hashtags but we like to use the term twemes.”

Tweetmeme

Tweetmeme – “put simply it watches what is going on within twitter and picks up anyone posting links to content. We then track how many other mentions of the same content are made (and how influential they are.) and present them in a simple format.”