There are so many ways to find your boy/girlfriend. People posted in a newspaper, join TV shows, ask for "smart" people by asking via SMS and so on. Some people are so eager to find it, so they are willing to pay as long as they got a match on what they expected too.
That's why there are some online service who listened to this "call" and responded by making this online dating service in which people can join and date online. I don't know here in Indonesia, but it is a popular service in other countries outside Asia, mostly in Europe and US.
Because there are lots of player on this area, people may get confused which service should they use, so here comes Free Dating Sites which helps them to have a look on those kind of services. It gives you a comparative details about most services available, including the monthly price and also countries where it applies.
You can see lots of criteria which can be used to limit your search, so you will (hopefully) limit your search and then focusing on small people rather than having billions of people matching your criteria.