If i'm on my computer at home, can someone else on a different computer (especially a Mac) be able to see my IM conversations or hack into my computer and see my screen and what i'm doing? I was having a personal convo with a friend about another person and it at one point related to a certain website, and soon after the convo I couldn't access that website at all, thought any other one is fine. They were online at the time and it was strange they had not tried IMing me, could they have read my convo and blocked me from the site?
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