That Snowden quote is a good piece of rhetoric and it's the first thing I think of when I hear the "nothing to hide" argument.
I'm not sure if it's actually true, though. It's possible that privacy and free speech are different enough that the logical parallel and inference made in the quote doesn't actually hold.
>>faster+(OP)
I think in a certain sense they are closely linked, because one of the very important things I keep private is... well, my opinions. I'm selective about who I say things to, and when, and if all my private conversations were to be made public, I would leave a great many things unsaid.