Kninjanin, it's the websites for me...social networks are people that I would rather keep in touch other ways: phone, in person, e-mail/snail mail. Plus, they seem to get hacked so often!
However Q/A websites, if operated in a certain way, you can actually learn so much; not only factual information but socialization/interpersonal skills, psychology and human behavior. And you don't even have to go out into the marketplace, you can do all this before breakfast, in your bathrobe!
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Also since 2010 when I happened upon Ask.com, about 85% of my book list has come from online suggestions, too, very fruitful there! I have left two websites recently because they were just not what I go online for, but I am glad to find Dan's because I would miss them now.