I know in the FB graph API, when you have a user’s facebook name or user ID, you can get all the functional information on that user from the graph API. When you only have the email address of a user, can you grab the fb userID from the graph API associated with that email address?
Thank You
You can do a query by email and receive the id, name, profile url etc. using the graph api. Unfortunately, that works sometimes and not others. It had been working, then this bug was reported:
Searching Facebook profile with email address is no more working with Graph API
http://developers.facebook.com/bugs/292220680814266?browse=search_4fa1307a895f67895398056
Then it was fixed on March 2.
Just this morning, it appears to be broken again. Using the search api, I can search by name and get results, but replacing name with email returns an empty list.
Hopefully this is an intermittent issue.