I use Goodreads and reddit for reccs. On this sub and /52books there's usually a weekly thread called "what are you reading?" It's either called that or has a similar name I forget. There I just see what other people are reading. Sometimes they write a short description of the book and I'll see what sounds interesting to me. Then I add them to my TBR list on Goodreads. When I go to the library I just pick a random few from the list and see if they're available.