PC Mag: With Twitter collapsing under the weight of its own success and Facebook's possible $800 million 2009 revenue tarnished by privacy concerns the time is right for somewhat faded social networking darling Digg to make a move. And so it has, with Saturday's Digg v4 Alpha announcement.
Airlines, Air France, KLM, and Ryanair no longer offer customer service support using Twitter's direct message functionality.
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