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Comment by hachiya | Hacker News Reader

Yep. Confirmed. Command line example:

Take the Base64 string from this line in the headers:

X-Facebook: from zuckmail ([OTguMTgzLjI0Ny4yMTg=])

  $ ruby -rbase64 -e "puts Base64::decode64('NzQuMTI1Ljk1LjEwNA==')"
  74.125.95.104

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That confirms that it's a IP address, not that it's his.

Or - that confirms that it's 32 bit number that when represented as a dotted quad appears to be an IP address.

I did the same for two Facebook notifications, from different friends, and both tagged their city (Tuscaloosa, AL didn't surprise me, but Blountstown, FL? That's fairly targetted).

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