Gibbs disclosed the block Friday, saying he doesn't use the popular social networking site himself because the world already knows enough about what he is doing, Tribune Newspapers reported Sunday.
Gibbs said he really doesn't know why the chief executive's offices blocked access to the site. Maybe to avoid taxpayer-funded tweets, Tribune Newspapers said.
President Barack Obama reportedly posts on two Twitter sites: @WhiteHouse and @BarackObama.
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