facebook - iFrame vs XFBML -

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I am getting confused with these two operations. Before I wrote this question, I saw about 5 or 6 other articles, but, I still do not know what I want.

Am I right by saying that the use of 'iframe' in code is not compatible with many mobile devices? I have always seen that XFBML is more suitable. I also tried some of my mobile devices and gave some "mixed" results. Can someone set me on the right course of code?

Only when you are sure to use xFBML that you need special function provided by XFBML , Eg multi-friend-selector.

Otherwise, iframe always likes.

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