We all the get same notification post by post, on multiple circles - so not a good idea to tag in un-related circles with all ones posts (just because its too easy to tag them) - in an effort to spread them as much as possible !!
(people tend to be irritated, and see it as Spam instead of the knowledge sharing you probably intended :-(
Especially now, when you can actually BLOCK people.
 (from your settings)

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