I don't think they will ever stop, Facebook needs data so they can work out and create data that they can offer to their advertisers because they offer targetted leads, they need location, preferences age and other vital information, without it, they have no way create targeted leads without it.
$5 BILLION is a big amount but not for a company named Facebook. They can easily pay this amount and they will continue doing what they are doing now. Technically speaking they have the the data of everyone who uses the internet (As all the internet users have facebook account) and they can use this data for their own purpose.