Not just Internet-illiterate — incapable of logic or rudimentary problem solving. I've been in situations where I was much less at home than these people were, but because I was willing to use my brain I was not as helpless.
That doesn't explain it. Suppose you or I act stupidly in 1% of those situations, and suppose only 1% of the people who came to fakebook (pardon the pun) couldn't find the login and complained. Than we could very well be all equally stupid.