Comments from website to a facebook group

You can use Send Button:
The Send button allows your guests to easily send your content to their friends or groups or e-mail address.

https://developers.facebook.com/docs/reference/plugins/send/

Ok, thx, so it is not possible to wright to a facebook group in any way?

you don't write to facebook group.
you are using facebook plugin to enable guests to comment in your site with facebook user name only.

Yes, I know, but I need to chose what group on facebook to wright to.

Just paste the above code located in Post #2 Or download the panel from post #4
Then simply enable the panel,If your logged into FB everything should work fine.
[tested & works]

Thanks you very much. Do you know where to put in my Facebook group link in the panel code?

here is the panel folder
put it in the infusions folder
add the panel from the admin panel

I did'nt manage to show anything with the code. Is there any place I need to replace something?

to add replay from your site to the guest's facebook profile
add new lower center panel which display in all pages
with this php code

[syntaxhighlighter brush=php,first-line=1,highlight=0,collapse=false,html-script=false]opentable("Replay from FaceBook";
$link = $settings['siteurl'].FUSION_SELF.(FUSION_QUERY ? "?".FUSION_QUERY : "";
echo '<div id="fb-root"></div>
<script>(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/all.js#xfbml=1";
fjs.parentNode.insertBefore(js, fjs);
}(document, \'script\', \'facebook-jssdk\');</script>

<div class="fb-comments" data-href="'.$link.'" data-num-posts="2" data-width="470"></div>';
closetable();[/syntaxhighlighter]