I was reading some comments about Facebook and privacy, and one thing that freaked people out was seeing their friends next to a "like" button strewn across the web.
Of course from a technical standpoint the like button is just an iframe coming from Facebook itself, and the same origin policy prevents the containing site from seeing the contents of the iframe itself, but how does a user know this? To them it's CNN knowing who you are, even though CNN never gets to see any of the traffic between you and Facebook (it just does iframe src= and then it's up to the browser to send cookies etc.).
Facebook can perfectly respect privacy here, and still many users will feel as if their privacy is violated.
Unfortunately I have no real solutions for this. Anyone have any ideas?