In some ways they are, though I'd mostly attribute that quality to Facebook. Taxing wouldn't do a thing, but creating more awareness around how destructive Facebook is might help more people think twice about using it.

Then again, that might not even be necessary. I think Facebook is going to be in serious trouble within the next 3 to 5 years. Instagram might be fine, but Facebook as a platform is definitely not forever, and it doesn't seem like anyone is really trying to replicate it.