All in all, it's the same information. Could have different colored tiles for different services, so you can use the avatar icons from the accounts themselves. Then it's just text or image or video. Click to make the tile full screen to show the full post information and all the relevent actions you can take for that service. Could also show the full conversation and/or comments, depending on the service.

Or instead of tiles, it could be single lines like in IRC. Maybe an icon somewhere in there to show if there's an image or video to view. Hover preview?

Nope, never spent any time thinking about it. No, siree. ;)

I thought about these tiles that move (scroll forever) their lifespan is the length of the screen. So you'd have to workout a ratio or something to be similar on all devices.

Each time can be a gateway to a real chat. I don't know what it would be for. But each tile can have a photo, video, text, ads, etc...

Just a continuous stream of content that only ends if no one clicks on it. Max life time (idle) of say 10min.