share - How do I set a custom image in the facebook sharer dialog? -

how can load image in facebook share dialog?

using service sharethis.com

http://screencast.com/t/8uox80ox

<meta property="og:image:secure_url" content="http://medtechhealthdev.com/images/share_big.jpg" /> <meta property="og:image" content="http://medtechhealthdev.com/images/share_big.jpg"/> <link rel="image_src" type="image/jpeg"  href="http://medtechhealthdev.com/images/share_big.jpg" /> 

the problem important meta tags spelled out. nazhetii "share" function not srobatyvaet. instead, image prescribed in "meta", loads page image. update dialog box, "share facebook" correct , korektno.

you can check problem facebook post sharing on faceboog debug , default image set sharing well.

https://developers.facebook.com/tools/debug

so whatever issue can see there , figure out solution, hope helps.

here example: http://developers.facebook.com/tools/debug/og/object?q=http%3a%2f%2fmedtechhealthdev.com

in image "og:image:secure_url" providing "http" , not "https", might creating issue.