I am not quite sure which template edits are necessary to make social share buttons be shown at the bottom of each thread, like this?
You can edit the template "wf_widget_threads_thread_full" and put the social network embedded code near the end of the template. Best before the last "</div>".
I am not sure that is the full story. You have to make sure that it is the thread in template that is shared, and not the page.
xfrocks @HenrikHansen All social embedded code allow you to specify an URL. You can use this value in the template: Code: {xen:link threads, $thread}