Has someone been fiddling with the filters?
10 or so Korean spam posts on Super User within the past few minutes.
Can we get this banned?
It was Korean spam, informally known as "bamwar". Google "bamwar spam" to find out more about this.
It often comes in waves. Today's wave was bad enough that an employee of Stack Exchange took action: Korean characters (in addition to Chinese) are currently blocked in post titles and bodies.