The Kilafahbook social media network is a network which is being used by ISIS supporters to stay in contact. The Kilafahbook social media network is currently hosted on the 5elafabook.com domain which is located in Egypt.
The social media network is trying to imitate the Facebook social media platform. The login screen of the Kilafahbook.com site almost looks similar to the official Facebook login page except the text are in Arabic.
The social media network is the perfect place for ISIS recruiters to find fighters which want to join the ISIS group. The 5elafabook.com domain is currently unreachable, once you try to visit the 5elefabook.com domain, you will get the 503 service unavailable error which is caused by unexpected traffic.
The social media network seems to be running on the SocialKIT CMS package which is a paid product. You can find more information about the socialkit CMS on the official website. The developers of SocialKIT claim that the CMS is capable of working with various social media networks and it allows people to create profiles and to communicate with eachother.