The same way I added Like to this post, I am sure they used more code to make it come up under the posts. I think the editor needs to be locked down for this stuff
you cannot control what is on the client side, you have to do something on the server side. Word filter is all very well, but uniquess is much better. Simply make it impossible to replicate becuase they don't have the nonce and it is constantly changing for that session.