Context matters. On an NGO forum talking about entrepreneurship in third world states and micro-loans, I would not expect a discussion of business ideas to include advice on starting mass scale VC funded internet startups. Similarly in the blog of a Silicon Valley startup founder I would be surprised to see advice, stated to be aimed at his peers, to include tips on starting a roadside stall in Zambia. These forums exist for different purposes and have value in their own context, without having to compete with each other. They're just different things.