Grandparent might have been saying that while that is close enough for now, as you pointed out with your allusion to Facebook, that won't be enough to keep it e

Grandparent might have been saying that while that is close enough for now, as you pointed out with your allusion to Facebook, that won't be enough to keep it excursive for long (ie. its not exclusive because of a core feature, but rather because most people haven't heard of it and can't be bothered). If it does become popular, everyone's mom will be on it, because she will have heard of it, and someone will take the time to explain it.