Missing OG Opengraph Meta Tags

How do I set meta tags for Facebook, LinkedIn, etc? Like the examples here: http://boostblogtraffic.com/social-metadata/
Whenever I post a blog entry, FB doesn't scrape the image from my blog entry, it scrapes an image from our home page.
Is there a way to set the og meta tags somewhere? Or am I doing something wrong?
The blog entry URL is http://logzilla.net/blog/using-perl-to-convert-ip-blocklists-blacklists-to-cisco-access-lists

I tried the FB debugger at https://developers.facebook.com/tools/debug/og/object/ and it says the tags are missing:
Like Button Tag Missing og:type is missing. The og:type meta tag is necessary for Facebook to render a News Feed story that generates a high click-through rate.
Like Button Tag Missing og:image is missing. The og:image meta tag is necessary for Facebook to render a News Feed story that generates a high click-through rate.
Inferred Property The 'og:description' property should be explicitly provided, even if a value can be inferred from other tags.
Inferred Property The 'og:image' property should be explicitly provided, even if a value can be inferred from other tags.