(adsbygoogle = window.adsbygoogle || []).push({}); Ok, there's a website I know which I've been using for some time. Basically, it can gain you any of these:

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It works by someone signing up, then choosing a category & liking/sharing/retweeting things, then you can add a website yourself and use the "coins" generated to gain likes/retweets, etc.

It works extremely well and is very fast.

They are REAL people doing this, and in about 10 hours, I gained over 500 subscribers on Facebook.

Proof:

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(my friends list isn't done by this - those are people who go to my college/school/work/family, etc)
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