Because they need an attention and a friend, some they share because its the only thing they can do or tell the feelings they felt.gathering advices and suggestions as well.:)
The academic suggested that some Facebook users feel the need to become 'mini celebrities' who are watched and admired by others on a daily basis.
They do things that are 'Facebook worthy' because the only way they can define themselves is by 'people knowing about them'.
Because sometimes, people think that they can trust people they don't know, more than those that they do. they feel like, no one will say anything because well no one knows them personaly