When Tinder launched, you could only choose pictures that you've used as your Facebook profile picture. I thought it was a brilliant way to cut down on bullshit because you have to use a picture you were willing to show the whole world (so, less likely to use that photoshopped portrait that doesn't even look like you).

Though eventually you could upload any image.

Either way, I don't think it's such a big problem. Most people know that the feeling of betrayal is the last thing you want your date to feel when you walk into the room. It's just not a winning strategy.

If anything ever requires access to Facebook, you can be 100% sure that it's done to grab whatever info is in your FB profile and not for fancy security reasons.

Even if they started from another reason, they'll at some point want to grab the data.