If I'd want to reach a group of the same interest, wouldn't it be the best way to find the people who publicaly liked/plussed this topic?
Is it currently possible to add all people, who liked a post?
Is it possible to create a Google+ circle of people who liked/shared a public post
google-plus
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Best Answer
Although the API can give you the list of people who +1, share, or comment on a post... currently there is no API that can do circle management. You should be able to write a webapp that provides links to each user in a short format, and then manually add each person to a circle, but that is probably the best you can do at this point.