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Read the passage below and choose the best topic sentence to complete the paragraph. Social media sites are fun and a great way to communicate with people from different times in your life, but they can also affect your life in ways you might not be able to predict. All too often, we haven't thought through potential consequences, as this hypothetical example shows. Let's say your friend has never used a social media site. She is considering signing up for one, so she asks you, the social media guru, for some advice. She asks, what are the risks and the benefits of having a social media presence? Should she even sign up for one? You're stumped. You, the one who has a presence on nearly every social media site, have never even thought about the risks and benefits of using such a site. You've just jumped right on board every time a new one has emerged eager to make yourself known and to get to know others. Suddenly it becomes clear to you: If you were more aware of the pros and cons of using a social media site, you'd probably be better equipped to give your friend advice. Any user of social media sites needs to become informed about the pros and cons of using social media sites. Why haven't you thought of these things before? A person will not benefit from advice coming from someone who lacks just as much knowledge on the topic as she does