A number of iPhones are experiencing battery life issues and some feel hot to the touch, possibly related to the iOS Facebook app. iLounge’s editors have seen both issues firsthand, and a number of tweets seem to verify there could be some sort of intermittent issue. Within the past five days, there have been a number of tweets on the matter, as a Twitter search for “Facebook app battery” shows. A post on blog.hagga.net took a look…