What got really transfer and used - who can we trust ?

With all those services that are using Face Book as identity, I am starting to get suspicious about the value they get from it. Here is the claim (in french):
What is advertised by the site
And here is the disclaimer from Face Book:
What Face Book is sharing

Who should I trust - I do not care about my public profile, all the information I put on face book is public and may not be accurate, so it's OK to have this shared with other for their use.

My list of friends - no way / I do not want them to get spam. What is of interest to me may not be of interest to them.

@Facebook, I do not mind sharing my face book email, but that's about it. 

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