This Is Marketing

by Seth Godin

Insight: Every good customer gets you another one: your best customers become your new salespeople.
Insight: Bad customers aren't worth pleasing.
Insight: Network effects can grow customer base beyond the few early adopters.
Insight: Early adopters have an incentive to bring ideas to the masses - it will make the idea more valuable if more people use it.
Insight: Connected tribes are more powerful than disconnected ones.
Principle: Focus on delighting good customers