Currently, we don't have the option to re-order the buttons in the JFBConnect > Social area. We have the Facebook button on the far right, as the width is not standard and can grow/have strange padding based on what layout type you choose from it. We do have this as an issue in our tracker to address in a future release, but I don't have a timeframe on when we will include the feature.
In the meantime, you can do a code workaround to get a different order:
1. If you want to rearrange Facebook to not be last, you can also edit /plugins/content/jfbccontent/jfbccontent.php around line 240 and swap the following two lines to make Facebook first:
$btnHTML .= $likeExtraHTML;
$btnHTML .= $likeHTML; //Make this one first
2. In /components/com_jfbconnect/libraries/utilities.php, the getExtraShareButtons method adds the extra buttons. If you want a different order of the other buttons, you can rearrange the if statements.