I've been a member of seoclerks since it started and I have recommended people to it for a long time. Recently they launched their affiliate program which allows anyone to earn a chunk from the great idea they came up with. For every customer I refer to them, I earn 10% of their sales forever. This is how it is different than your typical affiliate program and why it is possible to earn a passive income from them, just for referring clients. If you refer a visitor who buys today, tomorrow, or even 1 year from now.. You earn 10% of that!

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Check it out if you want start a passive income too:SEO Affiliate Program