I believe that with anything the extent that Facebook can do for good equals the extent that it can do for bad. So yes, they have a lot of information that could be used for good, bad, or (more likely) some of both. I certainly don't recall anyone FORCING anyone to click a "like" button nor have a Facebook account. If you are worried about this sort of thing then don't do it. I don't understand why there are so many people attempting to create a rebellion against a service that no one forced them to be a part of.
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I believe that with anything the extent that Facebook can do for good equals the extent that it can do for bad. So yes, they have a lot of information that could be used for good, bad, or (more likely) some of both. I certainly don't recall anyone FORCING anyone to click a "like" button nor have a Facebook account. If you are worried about this sort of thing then don't do it. I don't understand why there are so many people attempting to create a rebellion against a service that no one forced them to be a part of.
[1] Clarification