WP Smart SEO

This WordPress plugin lays the foundation for good SEO.

This means you get new fields for the following important information:
og:type
og:title
og:description
og:image
twitter:title
twitter:description
twitter:image
Meta Robots Tag: index, Follow, NoFollow, NoIndex

This means that search engines and social media networks always receive the correct information about the website in question. The plugin is not as crowded as many others e.g. SEO by Yoast etc – a good lightweight alternative