Just learned that Massachusetts has demanded Twitter provide them the IPs and other info of accounts belong to a couple people who appear to be suspected of involvement in doxing Boston police officers. That document was leaked today and appears here:
Twitter notified at least one of the people (there are three; weirdly, two hashtags are also named). They say they'll hand over all info within a couple of days unless they're notified about a motion to quash beforehand. I've given that person your e-mail and office number just now. Please let me know that you received this.