The Philosophy Job Market Wiki is now keeping track of schools that have notifed candidates about fly-backs as well as offers.  Again, I can not vouch for the reliability of this information (the site says, for example, that my Department has notified candidates about fly-backs, which may well be, though the Department as a whole has not been so notified, but that wouldn’t be unusual given the way my Department operates).  But anecdotal evidence and feedback suggests that the site was proving fairly accurate prior to the APA.

UPDATE:  A philosopher writes with the following apt observations:

One way in which the wiki site confuses things is by having coarse-grained
categories.  Example: "has notified candidates for flybacks" might mean has notified *all* flyback recipients or has notified *some* of them.  When things are updated by, eg, one candidate who has received a flyback, the "some" reading would be most natural. When it’s updated by a search committee chair, the "all" would be more natural. Unsuprisingly, candidates have more time to update these things than search committee members/chairs…..

Good advice, I hope some anonymous folks in cyberspace will heed it!