Was up at the Omega block today and there was a heap of broken glass shards all over the place. I've noticed there's been a bit of broken glass around the last few times I've been up there.
I'm pretty sure it's not climbers so this is more to make people aware and to be careful up there.
We're renown for walking around bare-feet at the base of crags and some of the little buggers I picked up today were razor (or glass) sharp and really hard to spot.
Each time I go there now I take a clip-lock bag and fill it with broken glass before I walk out but there's still a lot up there.