Despite 'transparency' claims, Facebook stops watchdogs from monitoring ads

"The propublica tool, much like ours, was aimed to provide users with valuable information about political ads to help shed more light on a process that has historically been very secretive," Marshall Erwin, Mozilla's head of trust and security, told Mashable over email. "Major tech companies need to provide more transparency into political advertising, and support researchers and other organizations, like Mozilla, working in good faith to strengthen our democratic processes.""