[ummjackson]

My guess would be closing stages of an acquisition, code audits etc. etc.

[nodesocket]

What acquisition makes a company completely stop working on product, cancel events, and stop social media?

[tptacek]

Most of them.

[jasonmccay]

Perhaps. My experience (a data point of one) wasn't like that. Why would you risk team productivity until the deal is signed?

[tptacek]

Depends on what you're doing with the team. Going dark is not, for instance, a strong indicator that they're going to keep the product alive.