Most experienced web surfers will tell you that the most annoying aspects of life on the internet are pop-up ads and spam.
Sure, some think that publishers who demand registration for news are a pain in the digits, or that sites which don't accept alternative browsers are sacrilegious. And of course, the unrelenting stream of porn and other nasties is a major turnoff. Still, they don't come close to making people's blood boil like junk e-mail and "pops" do.
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