This article is one example that shows how big companies like Facebook and Twitter become gateways to the internet. That means certain applications are not available to you if you are not a member of these companies (as an example). I think this is a troubling trend because the different sites exchange data, your data!
While we already have a privacy challenge with companies like Facebook this exemplifies this challenge. Do you know what companies get your data? What they do with it? If you can remove it at one point if you want to? How easy or difficult it is to remove any data? How this data drives what you see on the internet?
I'm all for sharing, exchanging ideas and communicating with others but I think you should be very careful what data you provide to whom to make sure you don't regret your decisions at one point.
