How many of you use this method?

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Manual traffic exchange sites or PTC sites to advertise your web site(s)? I do you use them both or just one? Yes, I've generated a copy of referrals I can't complain about 1 or 2 referrals will beat none anyday for me. But i was just wondering if anyone else use this method of advertising or use another method. Free or very low affordable pricing with in my budget advertising LOL.