Ask HN: How can my website use Tumblr to reach 18 year olds?

A few websites such as Mint and OkCupid are known (in part) for their popular and informative blogs. I've created a website geared towards students entering college and recently created a blog on Tumblr to help promote it. However, instead of writing about the product, I'm giving daily college advice.

I've been following some tags and following users that post about graduation. That's brought me around 220 followers in a couple of days.

From what I've seen, a lot of content on Tumblr tends to go viral. What are some tips to make my blog popular on Tumblr?