embed og:image in a component

hello,
I noticed a strange behaviour with open graph: if i copy/paste the page link into facebook, the correct "first image" appears, but if i click the "button_count" into the same page, a different (and wrong) image is selected as first image.

This happens with eventlist component, what you suggest me to do? Should i embed the "og:image" into eventlist component to show the event image?

With "lint tools" the only OG meta missing are OG IMAGE and OG TYPE. (developers.facebook.com/tools/lint)
I put "type=band" in Social->Open Graf->default so i solved the OG type missing but how to select the correct image in eventlist? should i set a variable into that component?

{JFBCGraph image=http://yoursite.com/imagetouse.jpg}

but can i use a variable inside this?
for example into eventlist template code:
{JFBCGraph image=$image}
(of course using the proper variable)

{JFBCGraph image=<?php echo ELOutput::flyer( $this->row, $this->dimage, 'event' ); ?>}

this is the call to the image but if i use with your code it does shows the image again. i'd need only the image url... there right?

ok i'm gonna ask first Julien if can tell me how could i call the function into the class

<?php //flyer
echo ELOutput::flyer( $this->row, $this->dimage, 'event' );
?>
i've tried with

<?php //flyer
echo ELOutput::flyer( $filepath , 'event' );
?>
but is not working