Wall Street Journal: Snapchat is working with Major League Baseball Advanced Media to bring weekly baseball-related video content to its popular mobile-messaging service. Using its “Our Stories” feature, Snapchat will curate content submitted by fans at baseball games around the country, package it, and push it out to users across its platform. The resulting “MLB Story” will be published every Wednesday or Thursday, representing the first time Snapchat has committed to regularly scheduled “programming” of this kind.