Sentence:  In Wikipedia this kind of activities is performed by members who assume distinct social roles, for instance the quality of the articles is addressed by reviewers and rollbackers, and the users' management is handled by <WSD>checkusers</WSD> and account creators. 
Meaning of the word marked with <WSD> tags:  A user who is granted access to view the IP addresses of wiki users, so as to identify sock puppets etc.