Islamic State, facing regular bans and blockages on social networks, have launched their own social web resource - Caliphate book.
The site 5elafabook.com went offline the same day. It is unclear who created the site and how many people are registered there, Gazeta.ru reports.
A message posted on the front page of the 5elafabook.com said it had temporarily suspended operations to "protect the information and details of its members and their safety".
