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In a unique partnership, NBC News highly-rated primetime newsmagazine, "Dateline," and the social discovery engine, Tunerfish, will be working together to help reward viewers this summer. Starting tonight at 10:00 P/ET, "Dateline" viewers can log on to during a mystery broadcast and share out to Facebook and/or Twitter that they are watching Dateline NBC to earn the 'Dateline Detective' profile badge.

"We're always looking for new and creative ways to engage our viewers and enhance the storytelling experience for our loyal fans," said Executive Producer, David Corvo. "‘Dateline's’ mysteries are about justice being delivered and we hope our audience takes advantage of this opportunity to feel part of that process."

Tonight's "Dateline" mystery looks into the murder of 28-year-old Melissa Mooney, who was discovered dead in her home in August 2009. The FBI spent years trying to find the murderer because Melissa was one of their own -- she worked for the FBI in Wilmington North Carolina as an office manager. Correspondent Josh Mankiewicz interviews the FBI agents who wouldn't give up trying to get justice for Melissa and reports on the ending that surprised them all.

"Dateline NBC," the signature primetime broadcast for NBC News, premiered in 1992. Since then, it has pioneered a new approach to primetime news programming. The multi-night franchise, supplemented by frequent specials, allows NBC to consistently and comprehensively present the highest-quality reporting, investigative features, breaking news coverage, and newsmaker profiles. Ann Curry is the principal anchor, and David Corvo is the executive producer.

Tunerfish enriches the TV experience by making it easy for viewers to share what they're watching, join the conversation around it, and earn fun rewards along the way. If you're not already a member of Tunerfish, you can join in just a few clicks via your Facebook or Twitter account. Tunerfish is a business unit of Comcast Interactive Media.