ссылки с параметрами для поделиться

vk

https://vk.com/share.php?url=<?=$url?>&title=<?=$title?>&description=<?=$desc?>&image=<?=$img?>

fb

https://www.facebook.com/sharer.php?src=sp&u=<?=$url?>&t=<?=$title?>&description=<?=$desc?>&picture=<?=$img?>

ok

https://connect.ok.ru/dk?st.cmd=WidgetSharePreview&st.shareUrl=<?=$url?>

tw

https://twitter.com/intent/tweet?status=<?=$title?> <?=$url?>

gp

https://plus.google.com/share?url=<?=$url?>

lj

https://www.livejournal.com/update.bml?subject=<?=$title?>&event=<?=$url?>