Microsoft today announced the closing of the Vine emergency meta news and social network service that they had announced in April 2009. No specific reason was given:
Despite positive feedback from customers like you over the course of Vine’s private beta, Microsoft has made the decision to discontinue Microsoft Vine effective October 11, 2010. After this date, you will no longer be able to access Microsoft Vine. We suggest that you record any contact information currently stored in Vine, prior to October 11th.
I frankly found the concept more than a trifle dubious at the time it was announced, but chalked it up as some sort of public service and public relations effort. That has now been ended.