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by catch23 5975 days ago
The jsonp method causes older browsers to use a ton of memory if you leave the browser window open for a long period of time. You'll see that there's a whole bunch of script tags in the dom that aren't cleaned up. Given the way people use facebook & how many old browsers still exist, this is probably the reason facebook decided against it.
1 comments

jsonp also causes unsightly "loading" indicators in most browsers.