There are a lot of sites that actually are made for the purpose of discussion about and help with issues, whatever they may be. So when someone goes onto Facebook or something, which is filled with some smart people but a heck of a lot of stupid people as well, and says, "Guys, I'm feeling depressed... maybe considering killing myself..." you don't know if the person is serious or just trying to get sympathy, much like a girl saying "Omg I'm ugly" to fish for compliments.
I'm sorry, and I'm sure there are a ton of people out there who are seriously considering it, or may have even done it, but the point is, it's pretty hard for people to take you seriously while among half the world's population of idiots.
So if you have some really serious problems, go somewhere where you can get some really serious help.