The "Galentine's Day" episode that sparked the cultural phenomenon aired ten years ago on February 11, 2010.
Galentine's Day is celebrated again on Parks and Recreation, this time in an effort to find a new best friend for Leslie Knope after the departure of Ann Perkins, Knope's long-time BFF.
The primetime show's invention sees so much popularity that it becomes a trending topic on Twitter the following year.
Season 2, Episode 16 of Parks and Recreation sees the female cast members celebrating the holiday with brunch and a gift exchange.