Wow! signal
In 2012, on the 35th anniversary of the Wow! signal, Arecibo Observatory beamed a message at Hipparcos 34511, 33277, and 43587. The transmission consisted of approximately 10,000 Twitter messages that National Geographic has asked fans to send in with the hashtag "#ChasingUFOs" (a promotion for one of the channel's TV series). The sponsor also included a series of videos with messages from several celebrities.