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In China,we can't use facebook or twitter of google+,so How can is custom my own Share button to Weibo, a service like twitter?
You'd need to modify the theme:
https://github.com/NodeBB/nodebb-theme-lavender/blob/master/templates/topic.tpl#L125-L133
You'll also have to wire up some custom javascript to handle the clicking of the link as well.
