Twitter Microblogging Brand

Twitter Central I subscribe to a great number of RSS feeds via a reader, but there are several businesses and organizations from which I receive traditional e-letters.  Today I was surprised to find that I received two emails from two separate companies--and the subject of each newsletter was Twitter.  Hmm. Three Types of Twitterers I guess it should come as no surprise, really.  I've been doing some research to identify corporate (a specific sector) and cause-type brands on Twitter and discovered...