Sailthru 2012 Annual Report - The Power of Smart Data
sailthru.com
http://blogs.wsj.com/digits/2013/02/11/why-user-recommendation-engine-sailthru-just-raised-19-million/
sailthru.com
They are able to look at their customers and see when they open emails, even report on the average time, but people are so much more noisy than they make it seem.
It's interesting that this attitude of pinning customers to a specific thing is so ingrained in their mentality that they bucket their customers: Johnson only ever drinks water, Aubrey rides his bike every day, rain or shine.
In reality people are complex and multifaceted, and it is important to acknowledge this when marketing to them.
http://blogs.wsj.com/digits/2013/02/11/why-user-recommendati...
techcrunch.com/2013/02/11/sailthru-19m-benchmark-gurley/