I think your comment is in line with mine. Many people think they are making a trade-off: The use of the service in exchange for data that corporations can mine.

Some even consider this a win-win, as they believe that they will receive advertising for things they may actually want to buy.

However, not everybody expects the data to be shared with other users of the service. This is why I suggested that this may be an unexpected escalation of expectations. Facebook is quite transparent about sharing your data with advertisers.

It is less transparent about sharing your data with other individuals.