https://www.reuters.com/article/us-facebook-privacy/facebook-backs-political-ad-bill-sets-limits-on-issue-ads-idUSKCN1HD2JH >Facebook Inc backed for the first time on Friday proposed legislation requiring social media sites to disclose the identities of buyers of online political campaign ads and introduced a new verification process for people buying "issue" ads, which have been used to sow discord online.