Prior Art to Pinpoint vs. Amazon, from 1980's?

Gary Robinson writes "I'm in a fairly unique position with regard to the Pinpoint vs. Amazon case since I built a system in the mid-1980's which is commonly regarded as the first active service based on collaborative filtering. It was a voice-mail-based dating service called 212-ROMANCE. I still have the 8-inch CP/M source code disks as insurance against CF-related patent lawsuits. Today I've posted a discussion of the Pinpoint vs. Amazon case in the context of that prior art as well other prior art from the 1980's."