Sonic Corp. is launching a series of summer promotions on Wednesday that include a “Twitter party,” half-price shakes, a tour by its “Two Guys” advertising comedians and new limited-time offer items to debut in July. RELATED • A look behind Sonic's Groupon test • MenuMasters 2012: Sonic, America's Drive-In • More quick-service restaurant news The half-price offer coincides with June 20’s summer solstice, the longest ...

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