Good point. But on Friendfeed one joins a room to read and discuss, whereas on Facebook joining groups is just for the purpose of one agreeing with its title. - Raphael, Raphael

Hmmm is that difference more about culture or a functional difference? A group on FB allows you to discuss just like an FF room. Each 'area' offers a main topic e.g. mobile, with sub-topics. Now in FF we have rooms but the topics flow like a river different but I suspect really much the same. We shall see what happens once FF goes mainstream. - Roger Kondrat