How much traffic do social networks drive?

[Joop van Hausenburgenreein]

Do social networking sites such as pinterest or sites like reddit or su drive traffic to sites?

If so, how much?

You always hear people say how they get thousands of views from these sites. Is this true?

[Maikel]

Yes you can drive a lot of traffic from sites like these, it is very dependent on the amount of followers you have though, and how much of them share your content.
Have you ever shared a link on Facebook for example? That's how most people get their traffic, the better the content, the more shares it gets and might go viral, resulting in more visitors to their website.