He said it would be up to consumers to decide if it is something that is appropriate or not.
At the same time, companies such as Yahoo and Google are coming under increasing pressure from governments in the U.S. and the EU to store all sorts of data for law enforcement purposes, Harper noted.
"I am quite concerned about governments using online services of all kinds as data sources," Harper said. "I tend to worry about the lengthening of data periods."
"Once they are fully tapped into online services and start using them as an ongoing source of information," it will be near impossible to reverse the trend, he said.
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