JKR's "Divide by three" comment

[amdorn]

I have a question for the group at large.  It seems very "off-
topic."  I was hoping someone might be able to give a bit of insight 
or theory to the meaning behind JKR's comment from her website.  In 
the Rubbish Bin section JKR talks about getting government approval 
for an addition to her home.  Which would supposedly give her a 
mansion with fifteen bedrooms.  My question pertains to her comment 
at the bottom of this page. . . . 

"Actually, it now occurs to me that 'divide-by-three' is a good rule 
to apply to a lot of 'news' stories."

This comment struck me as funny today. What news would she be talking 
about?  There have been a lot of superfluous news pieces but I don't 
recall any that deal with something that is a multiple of three or 
that could be divided by three.  Why is there special emphasis on the 
word news?  Can anyone help me with this?

Amdorn