Reddit advertising of “PAM Mastery”

I spent $25 on a Reddit ad that ran for the last week, for PAM Mastery. The ad (Pluggable Authentication Modules: Threat or Menace?) appeared in /r/CentOS, /r/Ubuntu, /r/sysadmin, /r/unix, /r/freebsd, /r/linux, /r/BSD, and /r/debian.

So what did I get for that?

62,521 impressions. 215 clicks through to the ad. 89 click-throughs to the book page.

How many of those translated to purchases? That’s pretty hard to guess, but: the links from my web site are affiliate links. When you buy the book fr...