Design Principles - An open source repository of design principles and methods

craigslist - craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events

Facebook Design Resources - A collection of free resources made by designers at Facebook

Bedpage - Bedpage is a classified ad posting a website that comes as the alternative to Backpage and offers almost all the major services to post for multiple categories.

Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.

YesBackpage - YesBackpage is the best backpage alternative and site similar to backpage classified. YesBackpage has replaced backpage.com as an alternative to backpage.