intelligence agencies to have been groomed by the saudi regime and went into twitter in order to spy on the twitter feeds of these activists. he was eventually fired by twitter and is now, we believe, working for the saudi government. so this was a very sophisticated campaign and it sort of shows how, while twitter and social media was hailed as this great democratizing force, there is a downside and a dark side that some of these authoritarian regimes can utilize quite effectively. >> can manipulate. mark mazzetti, your reporting is fascinating from "the new york times." ben wedeman, thank you so much for staying up late, i know it's 3:00 in the morning where you are. thank you both. a caravan of migrants is trying to enter mexico with hopes of making it into the united states. we'll take you inside their