Magnus - Shazam for art

UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.

Facebook Marketplace - Marketplace is a convenient destination on Facebook to discover, buy and sell items with people in your community.

Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community

Lancerlist - Find freelancers in your city

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.