It might be a good addition to have Open Graph tags added to the gallery "front pages" also. Currently the item_detail_meta.tpl works with single photos, but just noticed that it is not included in the gallery "front" pages where all the pictures are shown.
Now when a user shares a single photo page, the photo is included in the share as a link. But when a user shares the whole gallery, Facebook offers the logo of the site for the share link, which I think is not ideal. A sample image would garner more interest.
The og:image could be the first image of the gallery. Or maybe the galleries could have a "list" image similar as in blogs, that would be used with shares and lists. Althought that would mean a lot of work.
updated by @k-k: 05/20/17 02:23:10AM