By Nick Bilton June 27, 2012 11:42 am June 27, 2012 11:42 am Facebook’s iPhone app is slow. Often painfully slow. At Apple’s App Store, out of 38,000 reviews, more than 21,000 customers have given the app a measly single star. Users repeatedly describe the app as slow, crashes, stinks, fail and “is always loading.” In fact, I’d venture to say that Facebook’s iPhone application is slower than almos