Never heard of spadril.com before, but took a quick look and yes, it looks quite good, fun and easy to use. Totally with you on Facebook, I don't personally use it either, but my tip is to set up a fake ID for yourself. You can create a gmail account (for example) very quickly using any made up name such as ihatefacebook@gmail.com, then create a Facebook account using that e-mail address, and use it solely to access spadril.com. Took me all of a couple of minutes to do that.
It's a shame that Facebook is becoming so dominant that you can only register with a site if you already have a FB account, but that's the way the web is going, so I guess we'll just have to adapt.