The Facebook service can be accessed from devices with internet connectivity, such as personal computer, tablet and smartphone. After registering, users can create a customized profile revealing information about themselves. They can post text, photos and multimedia which is shared with any other users that have agreed to be their friend. Users can also use various embedded apps, join common-interest groups, and receive notifications of their friends’ activities. Facebook claimed that had more than 2.3 billion monthly active users as of December 2018.However, it faces a big problem of fake accounts. It caught 3 billion fake accounts, but the ones it misses are the real problem. Many critics questioned whether Facebook knows how many actual users it has Facebook.