habit that harmed their grades.]]> administration s efforts to "reform our government so that it is more efficient, more transparent and more creative."]]> continue to expand, niche social networking sites are being created for educators, medical professionals and other groups.]]> caption "Four more years" became the most re-tweeted tweet with over 816,883 re-tweets as of Nov. 19, 2012.]]> state had Twitter accounts.]]> niche social networking sites are being created for educators, medical professionals and other groups.]]> registration to everyone.]]> allow information to spread rapidly.]]> demonstrations in countries across the Middle East and North Africa.]]> wasted time far outweigh any benefit.]]> communication between friends and family and offer valuable access to educational materials.]]> protests in Tunisia spawned the Arab Spring, a wave of revolutionary demonstrations in countries across the Middle East and North Africa.]]> impact on their grade point averages when they used Facebook while studying.]]> educational materials.]]> expected to reach $32.9 billion by the end of 2016.]]>