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eBay: bidding on durable goods TaskRabbit: bidding on service BidAnswer: bidding on information BidAnswer provides the market for the information you have and the answer you seek. BidAnswer is a site that is best described as a market for information. With a large and diversified user base (open to any and all with internet access), BidAnswer provides a way for the user to attain information for practically any topic they choose.