When I was showing competitively myspace, facebook and well every other social networking site was nonexistent. We had ZERO relationship with the competition. Said the occasional hello to a trainer if you were walking past them, but never ever hung out with or spent time with.
Now don't get me wrong, it wasn't a BAD relationship, it just didn't happen. Hell even one of my trainers former clients (who quit riding during her college years) came back to the horse world and became a "trainer" (notice the quotes, lol). She didn't even say hi to us, and we rode together for years. It's just how it was.