Odd items have been created without the account owners knowing, and with no account or label.
See:
https://www.wikidata.org/wiki/Wikidata:AN#Techman224_.28talk_.E2.80.A2_contribs_.E2.80.A2_logs.29
https://www.wikidata.org/wiki/User_talk:S_Page_%28WMF%29#.22My.22_contribs
https://meta.wikimedia.org/w/index.php?title=Steward_requests/Checkuser&oldid=5829104
2013-09-24 20:33:32 <spagewmf> FYI, WMF Ops says my mystery bogus empty Q item sessions in the last week all came from the office and with my user agent, so we're back to suspecting some gadget
2013-09-24 20:34:21 <JohnLewis> spagewmf: A gadget on Wikidata?
2013-09-24 21:13:17 <legoktm> hello
2013-09-24 21:13:29 <legoktm> spagewmf: by chance were you moving pages on a wikipedia?
Version: unspecified
Severity: normal
Whiteboard: u=dev c=infrastructure p=0