One of the complaints I've had is that it's hard to find people's updates.

Ordering by userid (which is known) as opposed to postdate (which is unknown) will make it easier to find people's updates.

(I've left the feeds ordered by postdate, since that's how feeds are usually ordered.  I've also left the lists that only involve a single userid ordered by postdate, since that seemed to make the most sense.)

I'ld be open to making this a toggle, if you wanted the postdate-ordering.  (Although there may be other, better, ways to show you the info you were looking for on the postdate-ordered screen.)