suppose you see an article in your news feed while using the hidden service and click on it; facebook still has a good chance of learning about your browsing ha

suppose you see an article in your news feed while using the hidden service and click on it; facebook still has a good chance of learning about your browsing habits that way, even if you start from a hidden service. facebook might then learn which exit your non-hidden-service traffic exits to, and from there, it might have information to offer to advertisers about the identities of tor users using a given exit around the same time. even just having a strong authenticator of your real identity active on tor at a given time may be concerning, depending on your threat model.