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      'I Have a Dream' 50th anniversary: Tweets, Instagram photos from the anniversary

      Marchers set off for the National Mall early Wednesday. Photo: Indira Levine

      Hundreds of thousands of people have descended on Washington to commemorate the 50th anniversary of the March on Washington.

      Below, check out a collection of tweets and Instagram photos from people celebrating Martin Luther King Jr.'s historic "I Have a Dream" speech.

      To see your tweets and photos included, make sure to use a variety of hashtags, including #marchonwashington, #mlk50, #mow50 and #ihaveadream.