Twitterpostor 

A person who is impersonating another person via Twitter.

Person A: Did you hear that Jeff was receiving tweets from his wife?

Person B: No, What did she tweet?

Person A: She was saying that the pool guy was better in bed than the gardener, but it was a Twitterpostor. His best friend created a twitter account under his wife's name and he was the one sending out those tweets

Person B: Aren't you his best friend?

Person A: Yup!

Twitterpostor by Jalisciense June 3, 2009

Twitterstorm 

A sudden flurry of activity on the Twitter social networking and microblogging service that influences current events.

A focused effort of many people using Twitter to influence current events to their favor.

When Arizona tried to pass new "Solar Industry Killing legislation" the ensuing Twitterstorm caused Governor Jan Brewer's office to kill the bill.

Twitterstorm by JimmyJamez March 16, 2010

Twitterstorm 

The sudden emergence of a trending hashtag on Twitter. Usually indicative of Labour’s hapless leader having caused another racial or economic shitstorm.

“Tonight we’re organising a Twitterstorm to show everyone we support Corbyn’s views on Jewish people.”

Twitterstorm by Pjpw17 August 3, 2018