1. A method for facilitating collaborative decision making, the method comprising: receiving, at a computer system, data representing one or more individual postings and ratings associated with the individual postings, the data associated with a deliberation to make a decision; representing the received data in a hierarchical data structure; aggregating, through the hierarchical data structure, the ratings associated with the individual postings to obtain strength values; and facilitating collaborative decision making based on the aggregated strength values, wherein a processor unit coupled to a memory device in the computer system performs the receiving, the representing, the aggregating, and the facilitating of the decision making.