It's sad that it takes the death of a beloved actor to drive the point home, but in the last 6 hours I've seen about a hundred Facebook posts and Tweets about how real depression can be and how it often plagues those you least expect it the most.
All true of course, it just makes me wonder how many people will forget that after a couple of days of faux celebrity mourning.
Thousands of people commit suicide every year, and other than their close family and friends no one gives a shit. It does nothing to change the public perception and stigma of depression.
Don't neglect the lesson this has taught you once you forget about Robin Williams' death. Tell the people you love how much you love them. Tell them how important they are to you. That alone could save someone's life.