You have to be over 18 and already be connected with the person you want to chat with on other messaging platforms. | Illustration by Alex Castro / The Verge YouTube is reintroducing private messaging after testing new ways for users to share videos and "have conversations about them" last year. In an announcement on its official blog, YouTube says it's now starting to expand the in-app video sharing and messaging feature to users in the US and "other global regions" who are 18 or older. The v