Because EU citizens have a legal right to privacy; in the EU, your personal data belongs to you, and this ownership cannot simply be waived contractually.
From the EU charter of fundamental rights, which has constitutional force: Protection of personal data
1. Everyone has the right to the protection of personal data concerning him or her.
2. Such data must be processed fairly for specified purposes and on the basis of the consent of the person concerned or some other legitimate basis laid down by law. Everyone has the right of access to data which has been collected concerning him or her, and the right to have it rectified.
3. Compliance with these rules shall be subject to control by an independent authority
I wouldn't bet on Facebook in this case. you will see more of this, since most people in the EU speak English and are avid consumers of broadband, but are not especially sympathetic to the American philosophy of contract law.
As far as I can see, there is not much risk involved in asking Facebook/Google/Dropbox/Yahoo/Microsoft/Whatever to give you "your" data, as per European law. Then look at it and see what is wrong with it. Then file a complaint.
What can they do? It's the law.
Then make the thing public, disclose all your communication with your target, post the story to Hacker News and Reddit, maybe even get picked up by some important blogger or newspaper. Would look good on your resume to fight Google, wouldn't it?
It would look good to be hired for that purpose, and win. Litigious lawyers can easily end up looking petulant, though; if the complaint is trivial or frivolous, the lawyer in question risks being regarded as a bottom feeder. It's better to bring something new to the table, like a winning argument that hasn't been employed before. Of course, I may not be so idealistic in a few years' time :-)
From the EU charter of fundamental rights, which has constitutional force: Protection of personal data 1. Everyone has the right to the protection of personal data concerning him or her. 2. Such data must be processed fairly for specified purposes and on the basis of the consent of the person concerned or some other legitimate basis laid down by law. Everyone has the right of access to data which has been collected concerning him or her, and the right to have it rectified. 3. Compliance with these rules shall be subject to control by an independent authority
http://www.europarl.europa.eu/charter/pdf/text_en.pdf
I wouldn't bet on Facebook in this case. you will see more of this, since most people in the EU speak English and are avid consumers of broadband, but are not especially sympathetic to the American philosophy of contract law.