Of course there are many services which provide a share button. But when I e.g. want to share a website on facebook, I need to be logged in to facebook in the browser I am currently using.
Almost all browsers got an own share functionality build in, which triggers a system menu to choose which app you want to use to share:
This question is about: How to trigger this menu?
I know it is possible to trigger a phone call with a specified prefix in href attribute of links, like
There is no implementation in current browser/mobile OS to my knowledge. Since the question interested me - a google search revealed work on issues like this one.
Sorry - I do not known a workround.