70% of Snapchat users are women

"Roughly 70% of Snapchat users are women, the chief executive of the messaging app said at a closed-door Goldman Sachs conference Wednesday.
Co-founder and CEO Evan Spiegel said Snapchat users are sending 400 million “snaps” a day on the service, where messages disappear after a few seconds, according to a person who was present at the meeting. He said half of Snapchat’s users have tried out “stories,” a feature the company introduced last month to link multiple messages together."
Source:  WSJ, 20th November 2013