When testing a demo app in Instruments using the leaks tool, I get GeneralBlock-XXXX that can be 56 or 2048. This happens after selecting the Publish button. (which actually calls [Facebook dialog:@"feed"];)
Can anyone confirm this? Does this have anything to do with UIWebView?
BTW, it is reproduced only on device (I used iPhone4) and not in Simulator. There are more reports on this like: https://github.com/facebook/facebook-ios-sdk/issues/309
Thanks!