I often use Stumbleupon to quickly send links to a friend (but thats not sharing like you describe it). I think such a plugin would be usefull, but I'm not shur

I often use Stumbleupon to quickly send links to a friend (but thats not sharing like you describe it). I think such a plugin would be usefull, but I'm not shure if it could support a business (if that's what you have in mind).