Those who type "Facebook" in the address bar with the intent of visiting Facebook, do they ever actually generate clicks on ads? Read past the first result? Is anyone even advertising on google for that search term?

Google has to make sure that people type "shoes" into their search engine (Protip: don't) on a regular basis. I'm sure Google isn't too worried about losing non-profitable "app-launch" searches which really all should have had the I'm-feeling-lucky behavior bypassing ads anyway.