I bet these people were typing in 'facebook login' into the Firefox URL bar, which did an I'm Feeling Lucky search on Google. Most days, that takes you to the actual Facebook login page, but that day it went to ReadWriteWeb. How confusing for people who don't understand the complex rules of how the address bar works, and who are used to seeing Facebook redesign their page without warning every few months.
No, they didn't. The first result (and the one you'd get from I'm Feeling Lucky) was still the actual Facebook Login page. The RWW article was in the Google News results, which appear above the search results on the Google results page.
