Fundamentally on a macro-level, everything is the same thing. It's just a question of what that macro-level is. You've implied above that an A-10 and a unicycle are the same thing. In the sense that both can facilitate getting from point A to point B, that is correct. But, at the same time, you can't use a unicycle for air combat so in that sense they are not the same thing.
One can go one direction and say that a banana and a volcano are the same thing, as they are both composed of matter.
One can go the other direction and say that a penny and a nickel are not the same thing. Sure, they are both coins, but they have a different denomination. Or, to go to an extreme, a 2006 D penny and a 1992 P penny are quite different to numismatists, even though they are the same thing in respect to currency.
So it is both fair to say that social media and message boards are the same thing (for a chosen level of distinction) or that they are different things (for a different chosen level of distinction). The only question here is which level of distinction should be chosen, and that's a matter of taste.