facebook has 890 million daily active users which is a great source for your website's traffic .
I will add FB integration to your website like login , share,like features ,also I will make a FB canvas app for your site i.e your site will be loaded inside FB
so what's the point in doing it ? The user does not have to leave their chat and at the same time can use your website and share your content through wallposts , likes . thus their friends will also be able to see your content