NEED HELP !

HI FRIEND CAN ANY HELP ME HOW PICTURE CHANGE ON FACEBOOK COMMENT
WHEN SOMEONE WRITE WWW."ITSWEBSITE"#ANYWORDS
LIKE THAT :



IS A HTML CODE OR WHAT CAN SOME HELP ME PLZZ URGENT

it's simple dear search on google for youtube to facebook thumnail and you will find some websites.
paste the link of your video and then you can change the thumnail picture many times for a video. Then copy new url from that website and post in facebook anywhere.
i hope it will help you. Here is one website: picsee