Yeah, that link to the Fear Street Source, that book is from 2003.
But again; as far as I know, is that ONLY in the United States.
And the number from Twilight is world-wide. .,,,
But I guess Fear Street is indeed not as popular as Twilight. Especially because of the internet that wasn't such a big part of society back then, and due to the movies, and the total crazed hype around it.
And don't worry, I'll NEVER read ANY of the Twilight-books.