SAN FRANCISCO, CA  - DEC 9: Twitter changes to online and mobile versions of the microblogging site and a simplified design to make it easier to connect with others on Dec 9, 2011 in San Fransisco, CA
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SAN FRANCISCO, CA - DEC 9: Twitter changes to online and mobile versions of the microblogging site and a simplified design to make it easier to connect with others on Dec 9, 2011 in San Fransisco, CA