YouTube has the David Harvey video Anti-Capitalist Chronicles: Does Socialism Affect Freedom?.
This is not an exact quote, but it is how I remember his point – Socialism is the idea of providing basic necessities through the public domain. This fits in quite nicely with my previous post – The Roles of Capitalism and Socialism in a Mixed Economy. In fact, you might learn more by looking at both posts. This one may explain some things in the other post, and the other post may explain some things in this post. It’s not a matter of which one you see first.