Hi, I'm still looking for Tumbr blogs as affiliates, I'm selling a service targeted to Tumblr users. I've had great results on Fiverr, conversion rate from front page visits to signups is ~20% from Fiverr gigs. Based on my Fiverr results and conversions so far, 20 signups can easily be done with a single post, or a few caption links, if you have a few thousand followers. I'll pay you $5 for every 20 signups for my (free) service. PM me if you are interested, I'll tell you about my product, and I'll pay the first $5 upfront. Afterwards, I'll notify you about daily traffic stats. (but you can also check it yourself with bitly or something) Anyone with a 2k+ Tumblr blog should consider this, it's a rare opportunity.