I got news not from the Daily Prophet but Muggle.Net that a certain someone was starting to Tweet. Less than 10 minutes ago I became JK Rowling's 4458th follower on Twitter, however we noticed that her followers were growing fast. I guessed she would pass through the 5000 mark within 10 minutes by 19:48. I was wrong she made it at 19:43 and I managed to capture the moment for posterity*.
With the time now 19:52 she has 5,547, she's getting approximately 100 followers a minute at the moment.
* I'm quite good at guessing these things, but at the rate she was gaining followers even I was impressed by catching her at the moment of her 5,000. We were on constant refresh for a while and getting 3-6 every time we did that.