xkcd.org - xkcd: Tectonics Game

Keywords: side, rule 34, xkcd, rule34, geoguessr, xkcd sysadmin

xkcd.net - xkcd: Barnard's Star

Keywords: snopes, xkcd, woosh, five day forecast, maddow comedian, xycd

xckd.com - xkcd: Heist

Keywords: xckd, spike lee ghostwriter

almamater.xkcd.com - xkcd: Rolle's Theorem

m.xckd.com - xkcd: First News Memory