You are going to block this site. This will do the following:
- You will no longer see this site in searches.
- Site will no longer see your site in searches.
- Site will not be able to comment on your site profile.
- Any comments this site has posted to your profile will not be displayed.
Are you sure you want to do this?
He uses iframe tags with a Youtube URL's width/height set to zero. You can see for yourself by hitting f12 on his site - otherwise here is the answer on StackOverflow: https://stackoverflow.com/a/31108751