From the linked article:
"Overall, the picture is grim indeed. Out of 5.5 million female accounts, roughly zero percent had ever shown any kind of activity at all, after the day they were created.
The men’s accounts tell a story of lively engagement with the site, with over 20 million men hopefully looking at their inboxes, and over 10 million of them initiating chats. The women’s accounts show so little activity that they might as well not be there."