This isn't news. Chat and messaging are one and the same. You can message anyone, and you can migrate conversations arbitrarily between the chat and message UI,

This isn't news. Chat and messaging are one and the same. You can message anyone, and you can migrate conversations arbitrarily between the chat and message UI, or even both at the same time. If you message someone who you don't have good reason to message, facebook will classify it as spam and send it to their "other" box.