You know what's even more frightening? Your post led me to dig a bit into the Fermi paradox and following one link or another I arrived at the commemoration event [35th anniversary of the Wow! signal] at Aresibo. Wiki reads:
In 2012, on the 35th anniversary of the Wow! signal, Arecibo Observatory beamed a response from humanity, containing 10,000 Twitter messages, in the direction from which the signal originated. In the response, Arecibo scientists have attempted to increase the chances of intelligent life receiving and decoding the celebrity videos and crowd-sourced Tweets by attaching a repeating sequence header to each message that will let the recipient know that the messages are intentional and from another intelligent life form.
Imagine if the aliens actually get that signal! Celebrity videos? Tweets? I can just imagine the response "Well, obviously there is NO intelligent life on that planet, so we can use it to test our fully armed and operational battle station. Fire at will, commander!"