We looked inside some of the tweets by @katyperry and found useful information for you.
Inside 100 Tweets
Rankings (sorted by number of followers)
2. in category Celebrities
2. in category Singer
3. in country United States
@RealTimeWWII, a Twitter accounted created by Oxford history graduate Alwyn Collinson, narrates World War II on Twitter in real time; all the tweets are manually written, with no script used.