▁Cra igs list ' s ▁expansion ▁into ▁Ut ah ▁by ▁four ▁years , ▁it ▁was ▁able ▁to ▁use ▁the ▁network ▁effect ▁to ▁build ▁its ▁online ▁presence ▁during ▁that ▁time . ▁ ▁Crit ic isms ▁▁ ▁Gun ▁control ▁activ ists ▁raised ▁concerns ▁in ▁ 2 0 1 1 ▁that ▁K SL ▁Class ified s ▁did ▁a ▁dis service ▁to ▁its ▁community ▁by ▁providing ▁a ▁market place ▁for ▁sell ers ▁who ▁were ▁not ▁lic ensed ▁deal ers , ▁as ▁such ▁sell ers ▁need ▁not ▁perform ▁background ▁checks ▁on ▁buy ers . ▁A ▁ 2 0 1 1 ▁report ▁from ▁the ▁office ▁of ▁New ▁York ▁City ▁mayor ▁Michael ▁Blo om berg ▁found ▁that ▁K SL ▁Class ified s ▁had ▁more ▁gun ▁list ings ▁than ▁any ▁other ▁general - pur pose ▁online ▁market place , ▁exceed ed ▁only ▁by ▁online ▁market p laces ▁that ▁special ize ▁in ▁guns . ▁K SL ▁Class ified s ▁dis cont in ued ▁gun ▁list ings ▁in ▁the ▁w ake ▁of ▁the ▁Sand y ▁Hook ▁Element ary ▁School ▁shooting . ▁ ▁References ▁ ▁External ▁links ▁▁▁▁ ▁Category : On line ▁market p laces ▁of ▁the ▁United ▁States ▁Category : E conom y ▁of ▁Ut ah <0x0A> </s> ▁This ▁is ▁a ▁list ▁of ▁notable ▁discrete ▁event ▁simulation ▁software . ▁ ▁Com mer cial ▁ ▁Open ▁Source ▁ ▁Further ▁reading ▁ ▁References ▁▁ ▁Category : Sim ulation ▁software ▁discrete ▁event ▁simulation ▁software ▁Category : S cient ific ▁model ing ▁Category : Events ▁( comput ing ) <0x0A> </s> ▁No . ▁ 1 7 ▁Group