I wonder how privacy on the web would have been viewed if Twitter had become popular first. With Facebook, people expect their information to only be circulated

I wonder how privacy on the web would have been viewed if Twitter had become popular first. With Facebook, people expect their information to only be circulated among a small group of people (though practically this has been shown to be unrealistic). Twitter, on the other hand, seems to thrive on people posting information for the whole public to see. IIRC you have to enable privacy settings yourself. Now, did people in my age group actually want the Facebook-style privacy setup from the start, or did Facebook influence people's expectations?