I joined Library Thing in November 2013, and while I add new books as I acquire them, I still don't have every book I own entered. Today I discovered that more than half of my sizable Wodehouse section wasn't catalogued there. I spent a happy hour of my holiday figuring out which ones weren't and adding them. With Wodehouse, as with Patricia Wentworth, this will help me avoid duplicates, since I can't keep all the titles straight, between say Big Money, Uneasy Money, Money in the Bank and Money for Nothing, not to mention all the titles with "Jeeves" in them.
I currently have 1386 books listed in "Your Books." I think there are somewhere around 150 more to add, not counting a few duplicates (mostly Jane Austen and Dorothy Dunnett).
I use LT mainly to catalogue my books. I haven't really explored the other features, though I do have a few "friends." One of my favorite sections is "Members with your books," and my favorite part of that is where LT suggests what books I should borrow from them. I trust the warning that comes with those lists is tongue-in-cheek: "Obviously that does not necessarily mean you can borrow the books."
Usually when I click on that link, the first name on my "to borrow" list is Ngaio Marsh, with ten or more titles. The thing is, I've read Ngaio Marsh. I used to own some of her books. But something - what's the opposite of clicked? I came to realize that I don't care for her books. I've looked, but I can't figure out how to tell LT to please stop recommending Ngaio Marsh, or other authors I don't want to read.
I've just discovered the section where I can record how many times I read a particular title, which I'm always interested to know. I think of myself as a re-reader, and looking over my reading logs (and this blog) bears that out. I like knowing what I've been re-reading and when. With some books, it's almost every year. This weekend it was some Terry Pratchett books last read in 2007 (though I could have sworn more recently).
If there are any particularly useful or fun features of Library Thing, I'd love to know about them. And I should really figure out the groups, since I technically but passively belong to the Virago and Persephone group.
Edited to add: I've spent two "ice days" at home, checking my books against Library Thing. I
quickly realized that 1) I have a lot more books than I realized and 2) I am a
serious book squirrel, piling up TBR books. It's time to dig them out. I'm filling a bag for
the library sale as well.