habit harmed their grades.]]> role in shaping the political landscape.]]> dangers and wasted time far outweigh any benefit.]]> allow useful information to spread rapidly.]]> demonstrations across the Middle East and North Africa.]]> expose users to harm.]]> wasted time far outweigh any benefit.]]> communication with friends and family.]]> protests began in Tunisia, a country in Africa.]]> impact on their grade point averages when they used Facebook while studying.]]> strangers, do research, and share thoughts, photos, links, music and information about themselves.]]> uploads every day.]]> educational materials and allow useful information to spread rapidly.]]> expected to reach $32.9 billion by the end of 2016.]]> ranged from someone using a login without permission to being threatened online or in person.]]>