Hi
FWIW, I have deleted well over a dozen accounts and hundred questions in the last few days and several new user accounts even after this mail was posted. It is likely a single persistent spammer and perhaps scripted. Some serious measures are needed at this point since some of us constantly deleting users accounts and postings just isn't scalable.
Possible options
* Block by IP address * Limit open id signs to just Fedora accounts * https://pypi.python.org/pypi/stopforumspam/ * https://www.djangopackages.com/grids/g/anti-spam/
Rahul