I launched CareerCloud in early January. Its in Beta so I just wanted to do a “soft launch” by promoting it only through my social connections. That way I could evaluate the site and see how its working, fix the bugs, etc before I really started marketing it.
I emailed all 1700 of my Linkedin connections, started a facebook fan page and used my twitter account of almost 5,000 followers to spread the word. The result has been fantastic.
Over 50% of the referral traffic to the site has come via these social channels.
So its important to prime those channels before you launch. Start your blog now before you launch, get the facebook & twitter pages going. Start spreading the word BEFORE you launch. And by all means contact all of your Linkedin connections. You can email up to 200 of them at once. Social traffic is awesome and its mostly free.