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1.
When an event happens in the media spot light, be it a public stunt, video release, government policy or celebrity cry for attention which gets the Twitterverse flowing.

Often a hashtag will be created regarding the event and users will tweet their opinions, links to videos and blogs, or re-tweet popular Twitter users' popular opinions on the matter.
The Australian issue of internet censorship kicked up a twitstorm when it was announced that plans to block some websites would be put into place. The "#nocleanfeed" and "#openinternet" hashtags were flooded with opinion and a backlash against the government.
by EvIngro December 16, 2009