I had a couple of notifications on my lock screen on my iPhone, some Facebook, and some SMS. I was logged into Facebook on my PC, and saw the notifications there also, so used my desktop to see what they were. Then my phone screen lit up again, and on the lock screen were no new notifications, but the Facebook ones were gone, leaving just the previous SMS ones. Is there now functionality to remove and/or sync notifications across devices? I note that on my desktop I seem to see repeat notifications appear that I have already dismissed on my iPhone, so perhaps it's only iOS that supports is as yet? Can someone describe the mechanisms used to remove such notifications from my phone?