Oh gosh, I'm sorry to hear SS is closing! I hadn't heard. I save my pages to the store gallery where the products are sold, DST, Pinterest and at SS. DST is my most complete gallery, since it's store agnostic and it goes all the way back to 2008.
My most comprehensive gallery is at DST and I have been posting there since I started scrapping, a lot of my old layouts are pretty bad! I have been posting to the store galleries, but I also have my latest layouts from the last few years on FB and Pinterest.
I have been using the Stack It button for SS for awhile now. It made it so easy, so I post there more than at DST where you can only do 2 LOs at a time. I have been using Scrapbook.com for about 6 months. It makes me sad as each gallery closes. It is nice to have one place to look at all your work. I think that I will be more diligent to use Pinterest going forward. I think they will be around for awhile.