According to the Guardian, the mass exodus from the social networking giant is attributed to the coming of messaging apps like WhatsApp, WeChat and KakaoTalk, which host free instant messages through a phone's data connection.
Unlike Facebook, these apps promote dynamic real-time chatting with different groups of real-life friends, because one gets to connect with people who already exist in their phone book.
WhatsApp, established in 2009, is the biggest messaging app in the world by users, with more than 350 million monthly active users globally, putting Twitter's 218 million users behind.
The report said that since apps like these shun advertising, provide a more private sharing space like in SnapChat, and some like Kakao Talk offer services other than simple messaging or photo sharing, which includes gaming and music sharing.
However, these Asian apps are yet to woo the US users because of the stylized nature of their interfaces, vivid colours, characters and lettering, as the market there is used to being a little more subdued.