For
It leads to better services and personalization.
Against
It violates privacy and can be misused.
Anonymous excerpts, translated where noted.
“Appropriate mechanisms can select which useful consumer data is shown and used.”
“Personalized systems can respond to the specific topics and activities a user actually wants.”
“People should own their data, and companies wanting it should have to pay.”
“Amazon's Android application sold my data to third parties, which genuinely bothers me.”