... “granularity” … and “modulation”.
“Too much of a good thing”.
I ferr shurr don’t need to see avatars so often (Especially in RSS!!!).
And I like to keep connected to some folk w/o seeing everything they tweet.
Soooooo … a quick hack: mousever tweets on http://snipurl.com/1vud5 increases visibility of "second-tier" friends i.e. connections.