Halo there,
I have made up my own system!
I have like a logbook, writing down each day, when, where and how!
So, I can go back to a certain date and check which day of the week, I had the most response to my advertising!
I also write down which site I posted on, the good ones that work, I know I can reuse them!
The bad ones( the ones that I don't get response) I know not to waste time and money.
Hope this helps!
