Nope -- not me! I haven't posted anything to FB for about 2 years now since I deactivated my account there. I was, however, curious about that diamond you mentioned and went to Google maps to take a look. I see what you are talking about. I was not aware of that diamond or how long it's been there.

https://www.google.com/maps/place/Saginaw,+MI/@43.4193962,-83.900196,86m/data=!3m1!1e3!4m5!3m4!1s0x8823c24186e758af:0x29e3946d7baef5ac!8m2!3d43.4194699!4d-83.9508068