What are your thoughts on building multiple audiences considering trust and credibility is such an important factor?

Since your (Twitter) following is your customer acquisition channel, do you think this will restrict what you’re able to sell after this? In other words, do you think a following of hackers who aspire to be entrepreneurs will force you to sell “how to make money online” type material to continue your success?

I have a lot of subjects I would like to sell ebooks on, but that seems to conflict with the strategy of cultivating a specific audience around a personal brand.