I safeguard my personal information very jealosly in all social networks. Maybe, because I am a quiet (or antisocial) person or i prefer the real interaction, i unusually share my personal information or activities with a circle of acquaintances. Even now, for example, I don´t share a lot things with my extended family, because I am always late to the whatapp's conversations. When i watch the chat's conversations, pictures and others things, the time when i could write or respond is gone... 
Really, this is a problem for me. Sometimes, people think I don´t' care for them... Also, some friends include me in the whatsapp's groups and my participation is poor. Despite this, my favorite social media is Facebook. Although i don't share pictures or contents, I enjoy watching memes or humorous pages. I am a phantom of the social networks!