To use bookswapr, you just register the books you are willing to exchange on your bookshelf and explore available books at your area.
It's easy and fun to find interesting books, just swipe left if you don't want the book or swipe right if you could exchange one of yours for this book. If the person that owns a book you have swiped right is also interested in one of yours, it's a match. You can chat with people you've matched to arrange the exchange and make a new friend.
It's just like a Tinder for book lovers.