Is it common or is it rare? I don't necessarily need a "best answer" - any answer should help (as I tend to be someone who distributes my activity across multiple networks as well)
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The "association id" or
While it is possible to do cross-site queries using the Data Explorer, I don't believe it is currently possible to use the Data Explorer to get the association id that links users across sites, so for now this would have to be done locally using a data dump, rather than online.