Every site with a comment mechanism also needs a auto-cache mechanism

There are far too many times where I have been caught in the situation where I have written out a sophisticated and lengthy comment on sites like facebook and gmail, and before I could submit some act of random chaos, whether it be an accidental touchpad click or random browser crash, has rendered my contribution to an important discussion moot.

I very rarely take the time to say something, but I ensure that when I do it is,

A. Important to a discussion. B. Articulate and well written. C. Contributes a worthy point to the debate.

While I realize, as a developer, that said caching behavior would add heavy load to a web service's servers; the benefit is WORTH it.

Hell even having a feature in all web browsers that are smart enough to realize that a user is likely typing out a comment and should ask the user if we are really sure they want to reload or "the page is about to crash do we want to cache the input text?" would go a long way toward ameliorating this fact.

Can we please make this happen?