@tivsoy the Friends feed is intended to serve as a place for you to put the people and things you care about most. Noise is a place for everything else. Friends is for considering things closely. Noise is for taking a bit more of a surface glance. But, really they're just part of a rather simple duality, offering two ways of looking at things. Use them however you'd like.
Shift + 5 will allow you to toggle the linear Friends feed to a fluid grid, and vice versa, to toggle the fluid grid of the Noise feed to a linear feed with larger bits of content.