Given the URL of a public Facebook post, how can one find the post object in the FB Graph API?
We would like to be able to comment on or like a post via the v2.x Graph API, given the post's URL. Doing so requires the post's object ID, which we can make some educated guesses about, but accessing the actual object through the API has proven unreliable (works for some posts but not others).
v2 of the API introduced app-scoped user IDs, and post IDs generally seem to be of the form {app-scoped user id}_{unique post id}. Here are the details of some attempts to find posts in the API with various combinations of these IDs (global user id, app-scoped user id, and post id).
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Starting with a simple example: https://www.facebook.com/evan.prodromou/posts/10153023417510505. Key characteristics are that it's public, it's not a share of another post, and most importantly it has no photo(s), which add extra ids and URLs for the individual photo(s) and photo set. Evan's profile is also public, i.e. https://www.facebook.com/evan.prodromou doesn't show the generic This content is currently unavailable
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Trying the bare post id from that URL, /v1.0/10153023417510505 and /v2.2/10153023417510505 both give the Unsupported get request (code 100) error.
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Evan's global user id is 525575504. Attaching that as a prefix, /v1.0/525575504_10153023417510505 and /v2.2/525575504_10153023417510505 still both give the same Unsupported get request error.
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Same error using his app-scoped user id instead, /v2.2/10152350676805505_10153023417510505.
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Hoping to find the post in that user's feed, /v2.2/525575504/posts returns nothing, but /v1.0/525575504/posts returns only two recent posts, this like and this post. Not sure why only those two, even though has plenty of other recent public posts. The like is fetchable via its
idfield in both api versions, i.e. /v1.0/525575504_10153045879215505 and /v2.2/10152350676805505_10153045879215505, but both API versions return the Unsupported get request error when fetching the post via its id field, e.g. /v1.0/525575504_351575675029953 and /v2.2/10152350676805505_351575675029953 -
Trying another public post, this one with pictures: https://www.facebook.com/andigalpern/posts/678121182314631 . /v1.0/100003502653187_678121182314631, /v2.2/100003502653187_678121182314631, and /v2.2/499657186827699_678121182314631 all error.
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/v1.0/100003502653187/posts only includes one post, a like, and /v2.2/100003502653187/posts is empty.
For reference, here is the GitHub issue where we have been tracking this problem.