Tripadvisor
It is world’s largest social travel network with over 100 million travelers have being used. It was founded on February 2000 and located at Newton, Massachusetts, United States. The main feature is easy access worldwide to leading online travel agencies. User can login with facebook account or can register. User can get information of Hotels, Flights, Vacation Rentals, Restaurants or travelling destination.
 

 

  Twitter
Twitter is a social networking and microbloging service which provides user to send and read text message of length 140 characters. This text is called “tweets”. It was founded in March 2006. The headquarter is at San Francisco, CA, United States of America. Unregistered users can read tweets, while registered users can post tweets through the website interface, SMS, or a range of apps for mobile devices. Features:
  1. Tweeting for interacting with other users
          Posting a Tweet
         Deleting a Tweet
         Adding your location to a Tweet
         FAQs about the Tweet location feature
         Posting links in a Tweet
         About Twitter's Link Service (http://t.co)
         Retweeting another person's Tweet(s)
         Linking to an individual Tweet
         Types of Tweets and where they appear.
         Embedding a Tweet on your website or blog
         Adding the Tweet Button to your website
         Using the location feature on mobile devices
  2. Follow people