what is meaning of fb:app_id ?

brijeshtiwari1984brijeshtiwari1984 New Delhi100 Post Club
edited September 2011 in Social Media Opt.
Dear All,
Earlier I have asked about it, but nobody reply me.
I have seen a lot of website using meta property="fb:app_id" content="139139069928" at header section just like a meta tag, for what purpose this id is use, but I don't think why, if anybody know about the meaning of it please help me?
Do I know this id is use for Facebook page?

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