What is the best source for getting traffic for your web site.

Most of the people say, social networks.

but there is problem relating social networks, a new person can not easily get traffic from these.  First he have to join many groups and has to make friends. Or if he would make a group it need time to be popular.

So, it is a time taking process to get traffic (targetted traffic) from social media.

Are you agree with me.