It is quite telling that the article itself, towards the very bottom, prompts to share with facebook, twitter and google+ buttons -- but no share icon of any sort.
For good reasons, too: when you want to share something, you invariably want to do so in a specific manner, meaning email, FB, twitter, HN, etc., rather than plain "share".
For good reasons, too: when you want to share something, you invariably want to do so in a specific manner, meaning email, FB, twitter, HN, etc., rather than plain "share".