Gone are the days when relationships were circumscribed by geography and circumstance—the walls around our villages have been torn down and we are discovering, even ourselves creating, a new boundless social universe.

Companies like eHarmony, as Melinda Wenner Moyer reports, have leveraged data analytics, complex algorithms and other digital tools to maximize compatability among romance seekers. Selecting the right person to marry is one of the most under appreciated human challenges; can big data and digital tools help us to better date and mate?