Wordpress not populating Social Networks with Page Info & Images

Hi All: We have just launch a new website design that is missing a function for social postings. I am not sure on the term that describes it so I will try to explain it. You know when you are posting a URL to a social network like Facebook. Once you paste the URL in, the social network widget extracts the meta description, title and and images present on that page.

The custom WP site we launched does not do that. No matter what page you post into a social network the same data appears.

How do we make our Wordpress pages populate the social network with relevant page data?

Thanks,

Rob