Linking a band's Website to an individual's Twitter account


Hi All!
So recently the band Tennis put up their album to stream on their website. However, before you could listen to it, an individual had to choose b/t linking it to their facebook or twitter page. If the individual chose their Twitter account, it would post an automated tweet on their account saying that they were listening to the album and then of course supplied the link. I’m a complete idiot at all of this so any suggestions on how they did that, would be really helpful.

Thanks in advance!


Also, here is the link for their site: