There is no comparison between such a "I promise not to murder contract" and a contractual agreement between two companies regarding data integrity. Companies

There is no comparison between such a "I promise not to murder contract" and a contractual agreement between two companies regarding data integrity. Companies share sensitive information all the time, this is not a new thing, contracts are real things, breach of contracts is a big deal, consequences can be huge. Both FB and most of the entities with whom they would have shared data are huge, and there'd be way to much risk in not being smart with the data.