The first posting could include a short review of the stock selected (brief financials, business, outlook and current trading performance). From there, the debate could move to: 1) extended research; 2) narrative (ie: what I like about the stock, etc); 3) possible interpretative analysis (ie: covering strengths, weaknesses, opportunities and threats); 4) possible competitor analysis; 5) financial performance; 6) charting; 7) broker following; and 8) future trends.
A less controversial approach to this would be to select a sector of the week (ie: gold one week, banking the next). Perhaps, 2 sectors (one major, one minor). And, then, employing the same analysis /posting universe as outlined, above.