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I once worked with a digital marketing manager that spent most of her day running scripts to spam Digg and Reddit, and using her budget to "outsource" these kind of things (probably using Mechanical Turk or something similar). She'd worked at marketing agencies before, on a number of large client accounts (including notable names in tech and consumer electronics), and I'm willing to bet that she did the same kind of stuff.

They may have guidelines in place, but I bet they don't check up on what external agencies do, otherwise this woman would have been found out a long time ago.