Put an image on your PC and be connected to the internet... and the government can get it one way or another.. or show up at your house and take your stuff.
Right, but only with a valid search warrant. And in the case of non-US citizens, the US government has some more troubles to come to the house (well, some exceptions lately....)
If the government ever had interest in what you are doing it never took facebook to find it all out.
As I said before, it is totally voluntary. The internet in all its forms and security layers should always be considered public domain. Do you realize your slashdot debates and quips are adding to your portfolio?
Sorry, that's not true. The Internet is all its forms and security layers include public Web sites, private Web sites (login/password), Shopping sites incl. payments, backup sites, cloud computing sites, torrents and whatever. So, some should be considered public domain, some should be considered private groups, some should be considered really private.
Facebook has the option to set your privacy level (awkwardly, but it's there). The issue is that if this level can be easily circumvented by the government that it's really a privacy issue. And as other mentioned: Another big problem is that you might show up in Facebook without even being a member. Having chatty "friends" is enough.
Also, your response to my #2 assumes way too much. What I said was true... What you think I implied -- that privacy is for criminals -- is not at all what I said. What I said is true, read it without your assumed implications and in the thought process regarding TFA.
If you did not imply this, then it is like the "and when did you stop beating your wife?" question, which does not (?) imply that you did actually beat your wife.