Just got this question from a new member of my LinkedIn network today, so I thought I would share my answer with everyone. If you have something you want to tell everyone, or something that you want to sell, it makes sense that you want to go beyond your first level network to the millions (in my case almost 18 million) of people that are in your 2nd degree and 3rd degree network.  But how to contact those in your 2nd degree and 3rd degree network directly, all at once, in an efficient manner?