I really do hate Facebook... but here's something constructive (sorry for repeating myself): why not use a true bug-tracking platform?
It souldn't be too much difficult to set up Bugzilla, and it offers a great deal of flexibility (see
Bugzilla for deteils). Even Facebook
uses it.
Otherwise, as the Pocketbook-free project is hosted on SourceForge, a zero-effort solution could be to simply use the SourceForge bug-tracker.