facebook permalink URL problem

 facebook permalink URL problem  is an issue that POSSE implementations may face, where it is difficult to guess a post permalink URL based on the ID that Facebook returns. The other direction is even more difficult (or impossible), IDs cannot be guessed based on a post URL.

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This StackOverflow question has lots of details. These Bridgy bugs do too: 305, 350, 368, 375, 397, 447, 498.