FileProInfo - It's All About Files, Software, Online Tools - 100% Free
Goodreads - See what your friends are reading.
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Bookicious - Find the best new book to read with books collections for makers, founders and entrepreneurs.