[mcprwklzpq]

It seem like an illustration of the power of reciprocity in social psychology.[1] You give something away for free and then those who took what you gave feel obligated to give something back to you.

I sometimes wonder if those who give away their book for an email would get more emails if they would first give away their book and only then ask your email.

[1] https://en.wikipedia.org/wiki/Reciprocity_(social_psychology...

[geerlingguy]

I hate it when people ask for an email for something free; feels the same as those annoying pop ups when reading half of the world’s blogs these days. If I want to follow someone I’ll find an RSS feed :P