It really depends on whether you wish to pay for instant traffic or not.
If you do then use PPC mediums (AdWords, Facebook ads, etc.)
If not then Twitter and Facebook pages/groups can offer this.
However, you need to develop Twitter/FB profiles to gain followers before you can get any substantial traffic through this form.

create instant approval backlinks for your website.

On Social Networking sites..Engage your website to these kind of sites like Twitter, Facebook, Google+, and LinkedIN..

I Need something like any yahoo answer type website..??

I use Tweet Attacks PRO for traffic.

Backlinks are more for an increase in search ranking, not really to drive traffic.

Now this doesn't mean that backlinks CANT drive traffic, because they can and DO - but only when they are from relevant sites to your niche.

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You need to do SMO and yahoo answers for getting instant traffic and for back links do article submission,.

Traffic? Make your site more interesting. There are many factors that need to be considered in getting traffic to your site. And one of them is making it more interesting from your content, navigation and loading speed of your site.