Don’t blink Thursday or you’ll miss Sonic Drive-In’s latest drink promotion. Sonic Corp., parent to the 3,500-unit Sonic chain, is making its debut on Snapchat Thursday by revealing a “Mystery Disappearing Slush” flavor for just one day on the social media platform that is especially popular with Millennials and teens. The flavor is secret until Sonic posts its Snapchat reveal. Snapchat, a mobile app, allows users to send and receive ...

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