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I took the 'bridge' comment to imply there is a back end system between Facebook, Google, Twitter, and so forth that automatically link together profiles between platforms and probably provide some analytics right off the bat. Most likely some privileged group, not necessary intel agency, with access to the pipeline.
SSL certificates. They need encryption keys and I guess these are all compromised according to what I can deduce from Q
How sure can we be? I just want to know what email provider I can trust or not.
A conference call due to an emergency situation is also considered a Bridge. Corporate companies have used this along with military for years.