Maybe my dictionary is out of date, but I never have thought that a court ordered subpoena is a "spying" activity. If they broke in to twitter and trolled through data that would be spying.
Looking at the website it's coming from... maybe I understand now why they think a subpoena is "spying". They say the Bradley Manning is currently being tortured by US jailers, and insinuate the subpoena is a front to cover the trail of supposedly confirmed NSA wiretaps 2x blocks from Twitter HQ. Sure sounds like level headed, unbiased facts abound there.