sentence: Unsourced material is the greated harm, IMO, to an encyclopedia.
sentences_before: While what they added may or may not be true, they cited no sources.
sentences_after: Every fact should be verifiable. Feel free to revert my changes if you disagree, though.
concept_name: unsourced material
headings: Wikipedia:Administrators' noticeboard/Current issues and requests archive 26 More Disney Vandal