The love story between Kimmy Kirkwood and her fallen Marine boyfriend, Sgt. Will Stacey, will forever be preserved in a Facebook tribute of the two showing how their lives became intertwined on social media in honor of website’s 10th birthday. While most users saw their timelines filled with “a look back” videos over the past few days, 10 people were selected for a bigger project Facebook launched to highlight how people come together through social media. It’s called called “Ten Stories,” and was launched on Tuesday. Kirkwood and Stacey’s Facebook story starts when the young couple reconnected a few years after high school in…