Problem with surveys is, you have to be in a common demographic to make money on these. I live alone, no kids, am over 60, don't have cable TV, have an off-brand cell phone, don't own a home, don't drink a lot of soda, pay no attention to advertising, watch mostly PBS, etc. I was disqualified from so many surveys that I've quit. I did only 2 of about 40 at Your2Cents. If you're more average, go for it. It's fun.
I set up a separate email when I started surveys, but by choosing legit companies, I didn't get a single piece of spam anyway. I got my original list from a site similar to Green Book..
Also, stay away from the ones that give away only sweepstakes entries and ones that give only points. You get zilch for 1000 or 2000 points, maybe a $5 gift card.