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When I visited Google and Facebook, and then clicked on the Perspectives add-on button to check the certificate information, I saw this:

   enter image description here

What does this mean? Shouldn't it have more "graph" lines? Why just two? Is this secure? Do I have to worry about this?

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My guess would be that the other Perspectives servers couldn't check the certificate because of their geolocation and both Google and Facebook using distributed networks and load-balanced servers, so their requests would be served via a different server with a different certificate and couldn't be cross-checked with the one you're seeing in your browser. Doesn't look like anything to worry about to me, there's no red flag warnings displayed anywhere. BTW I cropped the image you were attaching to remove your info in the taskbar. ;) –  Noordung Apr 9 at 16:18
    
Thank youvery much :) –  user500468 Apr 9 at 19:37

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