[connortomas]

I don't think you're the average user. When I temporarily removed sharing buttons from a site I work on, we received a number of support emails complaining that it was "no longer possible" to share the content on Facebook. Many people simply can't be bothering opening Facebook, copying and pasting and link, and clicking "Post". For many, if a site doesn't feature a "Like" button, it simply can't be shared.

Unfortunately, your solution of enabling the user to install an add-on is not tenable for the vast number of users who don't even realise what a "browser" is. Apple's Mobile Safari solution works because it makes sharing simple and frictionless for the majority.