>yes this is a cool widget which would be very nice to have it working. However in my specific case the snipped grabs all the pictures on that particular page and a randomly piece of text. Not exactly what I had in mind.
>I would like to be able to pick a determined picture(s) and a determined piece of text.
>How to do?


I'm just jumping into the middle of this, so I may be answering a question that you're not asking.

If you're attaching a web page to a facebook post, and want facebook to automatically choose the right image to use as a thumbnail, put <meta property="og:image" content="url" /> in your web page.

I had to do this yesterday.