facebook says thumbnail 250x250 image is too small

facebook says thumbnail 250x250 image is too small

On http://www.stanuu.org/shall_we_gather.html
I have
j_cherry_fb.jpg is 250x250.
Facebook debugger tells me: Provided og:image is not big enough. Please
use an image that's at least 200x200 px. Image
'http://www.stanuu.org/images/j_cherry_s2.jpg' will be used instead.
I started with a 160x160 for j_cherry.fb, got the error above, cropped and
padded a 180x240 to be 200x200, then padded it to 250x250. Any ideas?
The basic problem is that I use portrait mode 180x240 pictures of our
minister, and every time I post a link FB cuts off the top of his head to
make it square. So I spent 30 minutes reading about og: and Link rel and
thought I had it nailed.
j_cherry_s2.jpg is 180x240.
I REALLY don't want to start using square pictures on my web pages just to
make FB happy.
Thanks.