[pmoriarty]

If experiencing something that's not shared is the only qualification for solipsism, then we're all solipsists, as (arguably barring the possibility of telepathy) our experiences are all private.

But that's not what solipsism typically means. Solipsism usually refers to the position that only you (or perhaps only your own mind) exist. By that commonly accepted definition, one could be mistaken or deceived in any of the ways I laid out earlier without them entailing solipsism.

[redial]

I meant to say shared context. Everything you said is part of a shared context or not, those are the only two options.

[pmoriarty]

Even if there is some sort of "shared context" (more commonly known as "objective reality") your view or understanding of it could still be deceived, hallucinating, simply mistaken, insane, etc. These are not solipsism. What they are are possible obstacles to your connection to any shared context or objective reality.

[redial]

Sure, but they don't change the fact those are the only 2 options.

And in the "shared reality" option, consciousness is somewhat measurable.