I generally register to every service with a different email address. The main ones I get spam to are the ones for Adobe, Groupon, Lastfm, Linkedin and oddly Ba

I generally register to every service with a different email address. The main ones I get spam to are the ones for Adobe, Groupon, Lastfm, Linkedin and oddly Battersea Arts Centre. Edit: That's based on a quick look in my spam folder, not anything statistically sound.