Geographical coordinates of supporting or refuting parties, where they choose to provide them (such as in profile) or knowledge of a particular area, may be incorporated in the weighing algorithm.

Yes, when we start looking at using a web of trust to help analyze truth in various domains, one of the more "advanced" topics can be to look at how information in related areas can impact opinions about a specific truth (in the example you mention, proximity when verifying identity). To solve problems like this in a general way is a very challenging problem, but coding for the use of specific, logically related information to help rate other information is clearly possible.