It seems to me that "sell your personal data to advertisers" sows more confusion through its recognition than clarity. People who hear "sell your personal data to advertisers" without your background tend to believe it literally - money is given to Facebook in exchange for personal information (ie, someone's name and particular data about them).
In terms of the "Like" button and other social plugins, unfortunately there's not all that much to be done about the way the technologies in the web works. Facebook came up with this "widget" that provided way more value to people than the equivalent buttons from Digg, Delicious, and several others, many of which encourage integration that uses resources stored on a central server which could allow tracking even without clicking on them. Many of these widgets need to talk to a server anyway - to provide credibility and popularity by showing how many people have liked the content. However, the "Like" button needs to talk to a server to provide its additional value - to show you a list of your friends who have also liked this content.
I encourage you to read the Facebook Data Use Policy, especially the section about "Social plugins" under "Other websites applications", and the link through to the Help Center that gives even more information about how that data is and is not used.
Comments
It seems to me that "sell your personal data to advertisers" sows more confusion through its recognition than clarity. People who hear "sell your personal data to advertisers" without your background tend to believe it literally - money is given to Facebook in exchange for personal information (ie, someone's name and particular data about them).
In terms of the "Like" button and other social plugins, unfortunately there's not all that much to be done about the way the technologies in the web works. Facebook came up with this "widget" that provided way more value to people than the equivalent buttons from Digg, Delicious, and several others, many of which encourage integration that uses resources stored on a central server which could allow tracking even without clicking on them. Many of these widgets need to talk to a server anyway - to provide credibility and popularity by showing how many people have liked the content. However, the "Like" button needs to talk to a server to provide its additional value - to show you a list of your friends who have also liked this content.
I encourage you to read the Facebook Data Use Policy, especially the section about "Social plugins" under "Other websites applications", and the link through to the Help Center that gives even more information about how that data is and is not used.