Admin: added more sharing buttons

I’ve added a WordPress plug-in that should allow readers to share a link to each post to a much wider group of websites and social media sites than before.  I’ve kept the old sharing buttons tho.  Most of these sites are unknown to me, but hey, the more the merrier. I’m not endorsing any of them, if anybody cares.

There seems to be a definite trend to enable sharing to sites beyond the Facebook / Twitter etc oligarchy, judging by a Google search.  This is a good thing.  In the last few years we have witnessed too much centralisation of the internet.  With luck this will now go into reverse.

Let me know if the plug-in goes weird on you or anything.