New Social Data on Librarything: when looking at your catalog in list view, select "more options." Not only does this add some buttons, including the delete button, as before. It now also lists by every book how many other users have it. You can click on the row-title "shared" to sort by this.
good. helpful because many of mine are Not shared - therefore no interesting recommendation info etc.
-to be fair, my eclectic collection is represented as all the more eclectic since I only entered what I felt like... ones I want to make note of. many of which I own and want to make note of precisely for their specificity.
-because so much unshared, my trial run of the Beta book suggestions feature yielded a list of little interest. mostly poetry, I guess many of the ones I share are poetry.

The recommendations and suggestions are all new. I haven't looked at Librarything in some time - had entered what I was most eager to enter - stopped at 177 books. since I had not reached 200, I had not needed to join and hadn't. and now I've missed the lifetime membership for $10 special. that's ok, it's now $25, which is still inexpensive. or $10 for a year - then what happens to yr library if you do not renew? delete?! ~harsh~ or just can't enter more ? ~ but that seems too generous ~.

UPSHOT - this yields lots of possibilities to explore. eg interesting to see what books I list that many others do list. I am looking at my catalog in my display style 4 (no cover, just title author tags/comments entrydate) w/ "more options" so that I see all the buttons (what is that plain white bubble? takes you to social data just like the sharedpeople/rec icon) and sorted by shared.
Top of the list, each with about 60 people sharing:
Tender Is the Night and Little,Big and Lullaby (Palahniuk, Chuck).
righto: a classic, a ~cult/scifiish favorite, a popular hip author.
Then Orthodoxy is owned by 40 people.
Designing Web Usability(Nielsen, Jakob) , Pattern Language, Closing of the American Mind about 30. Huh-a non-fiction tier of practical web stuff, architecture, ?social critique. ohits1guy.
Drops to the 20s for TSEliot, Wallace Stevens, Proust... and Noonday Demon, Set This House in Order, Blankets, Slouching toward Bethlehem. ok so I can see the convergence of mine and other libraries might only happen around poetry (where I have a few entered of consistent taste). maybe also a little around the popular edgy fiction?

and from here I can read reviews, and look around via the book recommendations, which
for book x list various books y ranked by the ratio:
people who own x / people who own y
a little bit of a thought twister? (backwards-bender) book y is being recommended to you because a high proportion of those who own it also own the book you own.
first expectation is that you'd see books ranked over the number of people who own book x. but I guess then you'd be dealing with a smaller pool, less information ... could think about this some more... and let's see all of that small pool might own harry potter because just so many people do. but if of that small pool four of them own another book y that only 5 people total own, that makes y that makes a good recommendation of y. okay.