Instagram and Facebook developers are working to integrate the platforms’ private messaging channels across apps. Early prototypes have shown the option to “Get Messenger on Instagram.” The integration could allow Facebook contacts to connect through Messenger on Instagram. Features from Messenger, including chat colour customization and video chat, will likely carry over as well.
As we've mentioned before, we're working on making our messaging services work across our apps. This is an early prototype, which we aren’t testing externally.
— Instagram Comms (@InstagramComms) June 3, 2020