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Query: If the request had not been blocked, would it have been followed-up by requests for all supporting files including many MB of images? If so, I'm glad it was blocked, since it doesn't seem to have prevented humans from following the link.
Thus depending upon YOUR FB Friends activityI don't have any FB friends ... because I'm not on FB ;) These are pages that someone else put up a link to; before all those robots there was the usual FB stuff where they fetch the page and all its supporting files. The exact format of the FB app UA string varies, but it's always recognizable as the app. Goodness, what a lot of people in Barsetshire* use iPads.
And it took me to a scaled down version of my Home page.The part I'd like to be certain about is whether all those blocked requests are happening in the background, invisible to the human, or whether they are all humans who attempted to view the page and weren't let in. Well, except the ones who were clever enough to detour to their browser. I took it as robotic because my 403 page has supporting files--it's how I identify blocked humans--and these supporting files weren't requested.