On SL, the term is mainly mis-applied to regular users of SL itself. These depraved individuals are often Recent Changes Junkies who suffer from Obsessive Compulsive Wiki Editing Disorder - see also User Preferences. However, they are basically not deshi. The term does not have a general meaning of student. It describes a teacher (senior) - pupil (junior) relationship.
Bill: I thought the deshi here were deshi of the sensei of Sensei's Library. ;-)