If you want people to seriously share they need incentives or something unbelievably cool or funny to do so. I'd go with option #1. There's probably a way to interest people with an offer or discount code or something with KickOffLabs like... I'd highly suggest reading the book Growth Hacker Marketing before you launch. Rock on!
<em>Growth Hacker Marketing</em> by Ryan Holiday is a good starting point. It's easily digestible and a quick read.
This should give you some direction. http://www.amazon.com/Growth-Hacker-Marketing-Primer-Advertising/dp/1591847389
I can recommend reading these books: http://tractionbook.com/ and http://www.amazon.com/Growth-Hacker-Marketing-Primer-Advertising/dp/1591847389
They were very helpful to us.
http://www.amazon.com/Growth-Hacker-Marketing-Primer-Advertising/dp/1591847389 - this book is a quick and easy summary of some of the practices/tactics