Social Network

Social Network - it is a structure of individuals/association that are connected to each and everyone, which made it as relationship virtually that focus on socialization, friendship, and everything that individuals likes to express. So can you name few of them? one best example of this kind of web based communication would be "Facebook" have you got one? or you have just been tag for your latest photo with friends? As we all know it is free, just create an account find you friends invite them then "magic" here you go chatting, posting comments, share what's on your mind and every feature of it.
Have you ever think on where does this creator of the free facebook account got budget in doing this? You know already that this is the no. 1 social media right now, or you might heard it. Yeah it's true and all advertiser are going to tie up with them for ads, marketing and everything that they can think, so they need to think of a way that they can't just spoils ads. Then that made them think to make a bidding process on placing ads and it depends on how much could be the initial bidding they call this as the "self-serve advertising". Not just this they have this virtual goods that made it cover up everything. 

All I can say is cooooooool they made to earn much much much because of the idea of letting the user create an account for free. Wow a big bow to them.