Zonblass - What Was on Blast?

Zonblass was as far as I know the first like product launch service specifically for the purpose of helping Amazon sellers rank for Keywords and so at the humble beginnings before it ever actually became a sass what we were doing No lie was individually emailing our list with our client's product promotions. So yeah fun times Well, how did they build that email list was it some other products that a list that they had or did they run Facebook ads to build that list?