The things is, a gw only pops up on the map after it has been mapped by a node it seems, while the twitter feed also shows a gw that is not on the mapper yet (after all, how?).
For instance this one:
I’m currently at work really close to it so I will go map it after an hour or so. It is not yet on the mapper so it will be fun to see it appear.
Similar goes for b827ebfffe8b0a59 near here which I mapped because I can actually receive it inside this building.
Great fun.