This post is to test the proposal I gave in answer to Tag synonyms and how they work.
I found that the tikzpicture tag was almost entirely unused, and those uses were probably accidents, and in any case that any question that could be tagged by it would be equally appropriate for tikz-pgf in general, since virtually all uses of the
tikz package go through
tikzpicture. Note that tikz already redirects to this tag.