Kind of an interesting precedent though that FB decided to build this in-house rather than buy Tinder as well.
I couldn't disagree more - Tinder shows you pretty much random people apart from some incredibly basic criteria (age, gender, proximity) whereas FB has the potential to be massively more effective at matching you given that it has a huge wealth of information (e.g. liked posts, pages, etc) to draw upon to select candidate matches to show you. It may naively assume that similarity is always good and that isn't necessarily true so hopefully their algorithm isn't so naive.
Either way, so FB's dating experience could completely destroy Tinder unless they get their ass in gear quickly and deliver a more more success-focused user experience, right now Tinder doesn't seem to care at all about match quality, nor eliminating fake & dormant profiles.