Because I'm on Facebook to keep up with my friends and family, and FB Purity gives me more control over the experience than I'd otherwise have. I know it's popular to hate them, but I don't. I don't love them either. I'm just happy to use them as long as they're the best platform for what I'm doing, which is a factor of what other options there are _and_ whether my friends and family will shift to one of them. (For the record, as far as I can tell there are no good alternatives at the moment.)
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