Yelp
Yelp is a website created for taking recommedation from people and an easy way to find whats good and whats bad in your city, like if your looking for a good restaurants or a dentists, hairstylists, and anything local. You can always consult people who are collected in one place who can recommend you on Yelp.com. It was launched in 2004 and membership to Yelp is free. Users of Yelp are Locals who are always aware about what's cool and happening in their city, and enjoy sharing this knowledge, and they are the one who have visited a place or used a service and want to share their real-life experiences and opinions with friends and other Yelpers.

User who wants to find current and reliable reviews about something in a given neighborhood, city or area can use Yelp as a source of information. Procedure of being part of this social community is very simple user can make profile on Yelp and then invite friends to join the community.