I use my EIN and have formed an LLC.
But don't take tax advice from internet messageboards. An EIN won't save you anything on taxes if you're a sole proprietor...you will still be taxed as a sole proprietor. If you're an LLC or S-Corporation, it's mandatory to have an EIN, so use that.
There is no legal way to get around paying social security, whether it's done through FICA or self-employment tax. I assure you.
I suggest you get an accountant and/or lawyer and discuss whether an LLC or S-Corp is right for you. Sole proprietorship is fine for the beginning, but that's it...if you want to get an EIN so affiliate programs and networks can't see your SS#, go for it. But the EIN has nothing to do with tax savings.