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One danger of online social networks is their visibility - in some cases, they work too well (Rettberg 77), that is, online social networks are dangerous because of how widely available the information on these networks are to the public. Many people who are on these social networks don't give it any thought before they put down very personal and important information. Due to how accessible these social networks are to the public, a stranger or someone you don’t know too well can easily go online and obtain your private information. There has been a case where someone announced on Facebook that they would be attending a certain event that evening. One of her friends from awhile back would eventually come across this information and break into her house. This case goes to show that people sometime give out information without knowing just how important it is. The problem with online social networks is that you don’t know who has access to all of this information.