Yammer is opening up its microbogging platform. In "Yammer Community" people may now create a community without the requirement that an email address be associated with a particular domain.
A US study (http://pewinternet.org/Reports/2010/Social-Media-and-Young-Adults.aspx) has indicated that younger internet users are losing interest in blogging and switching to shorter and more mobile forms of communication. The number of 12 to 17-year-olds in the US who blog has halved to 14% since 2006, according to a survey for the Pew Internet and American Life Project.
Mashable write up of our Twitter article: Alan Cann, Jo Badge, Stuart Johnson, Alex Moseley. Twittering the student experience. ALT-N, Vol. 17, October 2009. http://newsletter.alt.ac.uk/xrctg5ovlfkimsphpsy77s
This site provides a simple bookmarking service. We follow your twitter feed, and whenever one of your tweets contains URLs, we add them to your delicious.com bookmarks. Optionally, bookmark URLs in @replies to you. We'll even add a delicious tag identifying the sender if you like.
Many users get "filtered out" (they prefer that term, to "banned") from Twitter's search index because they unknowlingly violated one ore more of Twitter's odd Rules that discourage spamming. Twitter does a less than stellar job of making user's aware of these Rules, and an even worse job of clarifying exactly what the rules really mean. It's all very vague. What being "filtered out" means is that your updates will not show up in any searches, hash tag streams, ete. Tweets that mention your name will show up in a search, but not those actually posted from you.