Best book on persuasion and building community
blog.getsponge.com
blog.getsponge.com
It is a fantastic book backed up with tangible examples (psychology studies, mainly), and if you are in the business of persuading customers, I suggest you grab a copy. It covers most of the content from the Psychology 331 (Social Psychology) course I took at university, and is a worthwhile read.
Cialdini's more recent collaboration - Yes! - is also interesting, rehashes the basic principals, but then adds in some more current research, scenarios and applications.
Keep Cialdini's "weapons of influence" in your back pocket when trying to persuade anyone -- but especially when writing your own web copy and/or creating A/B or MVT tests of your web copy. The concept of Reciprocity is one that more 'freemium' startups should be thinking of when trying to monetize.
Caildini writing style is clear and concise. He neither talks down to the reader or uses jargon