Also aren't the FTC's Fair Information Practices just recommendations with no consequences for violating?
http://www.cnil.fr/english/data-protection/rights-and-obliga...
Practically, if you operate a service in France, you need to have 2 checkboxes at user creation:
* I accept to receive commercial informations and advertising from the service
* I accept to receive commercial informations and advertising from third parties
If you don't have the checkboxes or the user unchecked, no sharing.
http://www.legislation.gov.uk/uksi/2003/2426/regulation/22/m...
http://www.legislation.gov.uk/uksi/2003/2426/regulation/30/m...
Judges range in how they feel about these complaints, generally you won't be able to claim just for the time they've wasted, you'll have to justify why you have suffered damages. Extreme cases are different, if they're truly wasting huge amounts of your time, but the occasional email is unlikely to be enough for wasted time.
Alternatively, you can get the ICO to tell them off even if you haven't suffered any damages, but that's not always easy…