Back in the early, heigh-days of the web, there was a service started up that allowed anyone to add any annotations to a web site that they desired - I thought

Back in the early, heigh-days of the web, there was a service started up that allowed anyone to add any annotations to a web site that they desired - I thought this was pretty neat, until it wasn't, due to abuse. But I still think we need this kind of service, allowing anonymous annotations that could be turned on/off as a visible layer for any visitor to a website. Seems to me, it might be time for this idea to be re-tried ..