Me: "where can I opt out of this FB sales?"
SS: "Unfortunately you can not opt out from this option."

Lovely... 

You get 38 cent for a small thumbnail, or you will sell a full res for 38 cent. The image can only be used on Facebook, against a royalty free licence to use the image everywhere.

The licence is more restricted an the size sold is smaller. Why would you want to opt out?

How can it not be a good deal to me? I am selling more images, and the images sold have restricted use. Otherwise A) I wouldnt have those sales, B) I may have the sales but with a broader licence.

I know you and a few others will tell me I dont know what SS got out of the deal, but you dont either. So therefore, as it is, it looks like a good deal to me.

Naturally, I'd like to be paid more but the FB deal has generated $75 per month for me on average. This is a fresh and growing revenue stream from newly acquired market share. Good business.

Yes, Facebook deal. I tested it and the images were paid as SOD: http://www.michaeljayfoto.com/distribution-channels/shutterstock-and-the-facebook-deal/

I think it's a good deal: The actual user gets a tiny image that only can be used for the FB ad and they don't have to pay for it because FB covers the cost within the ad fees. We are actually giving away less rights for the image than if any client would buy it through his own subscription.

Basically they have now established 38 cents as appropriate compensation for a photographer when his image is used in an online ad.

What's the point of handling it special if it is subscription price?

Naturally, I'd like to be paid more but the FB deal has generated $75 per month for me on average. This is a fresh and growing revenue stream from newly acquired market share. Good business.