13. Thank you!
Images:
!
Shaking hands by Aidan Jones: https://www.flickr.com/photos/aidan_jones/
3575000735/!
Rainbow bookcase by Pietro Bellini: https://www.flickr.com/photos/
pio1976/3330670980/!
Footsteps by Tom Rolfe: https://www.flickr.com/photos/kapungo/1132461388/!
LibraryThing logo from librarything.com!
Scrabble letters: http://www.granicus.com!
Book covers from amazon.com!