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.
M. Tsagkias, M. de Rijke, and W. Weerkamp. Proceedings of the Fourth ACM International Conference on Web Search and Data Mining, page 565--574. New York, NY, USA, ACM, (2011)