Is link-building your ONLY traffic strategy?

social networks are powerful traffic bringers. They have an effect of snowball, plus powerful backlinks

 

Nope, social bookmarking, SEO organic results and forum posting

 

link building bring me very less traffic, it helps only on my PR
SERP and socal media is my major traffic source

 

isn't Link building SEO?

 

Link Building (from the word itself) means putting links to other websites to gain BACKLINKS. They are not primarily for traffics. But there are chances of gaining traffic from it.
Social Networking and joining different social groups is a good way of marketing a website.

 

The most important is quality content, so that the visitor comes back again and again.