Absolutely the bridges are a thing. Facebook Messenger is aggressive about kicking users that are using Facebook's app, Google Chat isn't amaaazing about the si

Absolutely the bridges are a thing. Facebook Messenger is aggressive about kicking users that are using Facebook's app, Google Chat isn't amaaazing about the sign-in flow currently, and Signal was deeply unhappy with me last I tried (possibly due to using a VoIP number), but overall, my chats follow me everywhere. Regardless of whether I grab my Pinephone or BlackBerry (whichever is charged), all my messages just follow along with a single sign on. It's fantastic :)