Per the Houston Chronicle, NASA announced Wednesday that a 1,200-pound U.S. satellite and 2,000-pound Russian satellite collided on Tuesday about 500 miles above Siberia.
American twitterers began reacting to the incident Wednesday night.
@howdyjack (Pacific Northwest, U.S.): 1st in-orbit commercial satellite collision? The start of things to come?
@BobStemen (Texas): commercial satellite destroyed in collision with another satellite? we need space cops
Some were skeptical about the collision.
@BLKROCKET (San Francisco, Calif.): A collision or a planned accident? LOL
One man found some irony in the release of the news.
@ccheney (Austin, Texas): Weird that the #Satellite #Collision and #Sirius Satellite Radio's possible bankruptcy are trending at same time.
http://is.gd/je5m @elpinturrichio offered one of the first tweets on the incident outside of the United States.
@elpinturrichio (Vilnius, Lithuania): Whoa. A Russian and a US satellite collide in orbit.
http://tinyurl.com/b46oy6 This was bound to happen some day really
As of this post, there's yet to be any Russian tweets referring to the collision.

American, Russian satellites collide