Looking at your requirement where you need to have different URL based on post/page you have to make a minor change to the plugin code and add a function outside the plugin.
Add below line to WP Socializer -> core -> templates.php after line 329 after the for loop.
$btn_obj = apply_filters( 'wpsr_mod_followbar_button', $btn_obj );
Add the below function anywhere in your theme. You have to expand this function based on what URL to you have to set based on the page being viewed.
Below function has an example of facebook button URL being changed in contact page.
function change_follow_bar_url( $btn ){
$id = key( (array) $btn );
if( is_page( 'contact' ) ){
if( $id == 'facebook' ){
$btn->$id->url = 'https://my facebook URL for contact page';
}
}
return $btn;
}
add_filter( 'wpsr_mod_followbar_button', 'change_follow_bar_url', 1 );
Thanks,
Aakash