I gave Leafmarks a try. Here are my impressions so far:
Designed by Goodreads expatriates. It has a nice look and is easy to navigate on a large screen. It's not as mobile-friendly as I would like; navigation was difficult on my Galaxy Nexus (phone). It is
slow, even on a FIOS connection. I just clicked on one of my bookshelves, and it took about three full seconds to load. On a mobile connection, it's even slower. You'll see the "loading" symbol often while you're on the site.
The site allows importation of Goodreads CSV files only. Importation was fairly speedy and smooth. Internal links in reviews to GoodReads material are NOT stripped. Shelves were imported properly, and I haven't found any errors yet.
Leafmarks does have many of the features that Goodreads had, ones which are missing from many similar sites. You can easily "like" and comment on reviews. Speaking of "liking", it allows you to sign in with your Facebook ID, but you can also create an account directly on the site itself (which I prefer, as Facebook is arguably as bad as Amazon). It's very
easy to look up all reviews of a specific book.
You can post "status" updates, which can pretty much be whatever you want; your milage may vary, but I rather like that feature. There is a "Community" tab, but it's currently limited to a list of top reviewers and giveaways; there are no discussion or topic-specific communities that I can find. That would be a nice feature to add.
You can follow reviewers by adding them to your Friends list. There are author pages, although the bibliographies seem incomplete in some cases. I noticed no advertising, nor were there links to sell books as far as I could see. The site is, of course, sparse compared to Goodreads; many of the (admittedly rare) books that I reviewed weren't reviewed by anyone else. But the reviews did seem genuine, and some are quite well-done and interesting.
Overall, I'd say that it's a very promising site!https://www.leafmarks.com/