Ask HN: Source for possibly-connected outages

This morning, I have experienced outages with Facebook, NPR, and LastPass.

Is there a good resource to identify outages that may not appear to be connected? It could be that they are using a shared service provider or that they are part of a coordinated attack.

As a small SaaS, I see these outages and immediately want to know if there is something going on that may impact us or may be a source of support requests.