Spamming is not useful. Once you do a blast, most of them will get deleted after a couple of minutes, or if you are lucky, maybe after a couple of hours.
That's why i don't invest into these blasts of spam. There's also a risk of getting penalized by Google if they figure out what you're doing.
This was one of the aims of Google Panda also, as it targeted large mass content article sites that targeted too similar keywords over many pages. Many of those sites received a blow in search...
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