Great article, might lay some rumours to rest:
BBC News said:Handling the London Waterloo rush hour on Twitter
It was 15:30 on a Wednesday, and a man was threatening to throw himself off a bridge and into the path of an oncoming train.
As emergency services tried to talk him to safety, which they did, Allison Dunn was left with a different problem - the rush hour.
As South West Trains social media head, she knew thousands of commuters were about to descend on Waterloo - London's busiest terminal - and many would turn to their phones for information.
At 15:33, she tweeted on the official South West Trains Twitter account: "All lines through Wimbledon station currently blocked owing to emergency services dealing with an incident at Wimbledon. More to follow."
There was a lot more to follow . By the end of the evening more than 150 tweets had been sent out - double the usual number....