'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.