The bitter 2015 divorce of David and Barbara Mikkelson is the fuel that ignited the battle for the popular fact-checking Web site, Snopes, which is now resorting to a GoFundMe drive to keep it afloat. The showdown takes on added gravity because the popular site, owned by Baday, is one of the outlets that Facebook turns to for verification of stories when it receives complaints of fake news. Fans of Snopes have been responding in droves since Monday, when the company said that Proper Media — both tech partner and part-owner after buying Barbara’s shares in 2016 — has been...