I had to think about this one for a while, but "twitter" and "google" are real (rare) words, and "facebook" is just not a word. A discovery that shouldn't come

I had to think about this one for a while, but "twitter" and "google" are real (rare) words, and "facebook" is just not a word. A discovery that shouldn't come surprisingly, but does because we're so inundated with branding!