If you'd like, you may join me in recommending Eloquent, a free service allowing users to highlight anywhere on the web and have it automatically copy/pasted to its own built-in window. Privately.
Image the the web cleaner, serene, eloquent!
I'll admit to feeling spammy at times with my highlighting. It's the social aspect that messes with my mind.
Any loss of focus is going to have an impact.
Suddenly, my highlights are no longer coming from the most personally relevant point of view.
Without purpose, or a true will to follow, nothing matters.
Everything becomes spammy.
Reason is the pristine form of being. I must remind myself of that.
This make it worth the transformation—
And it's free.
edit: It's a Chrome browser extension, still in beta mode. Works pretty well in Opera.