When online-dating giant Match Group (NASDAQ: MTCH) filed to go public in late 2015, one item in its business was not like the others.
Among its stable of popular dating sites and apps, including Tinder, OkCupid, and PlentyofFish, was the educational company Princeton Review, which offers test-prep services and a popular guide to colleges. The marriage between the dating and non-dating services, however, left many investors scratching their heads.