14. The processing system of claim 13 , wherein the one or more processors is further configured to: map the spam score to a context-specific curve associated with the business listing context to determine a probability that the particular business listing is spam; and identify the business listing as a spam listing in response to the probability being greater than a probability threshold.
13. The processing system of claim 9 , wherein the one or more processors is further configured to: identify a spam score for the particular business listing using the differential characteristic; and identify the particular business listing as the spam listing in response to the spam score being greater than a threshold.