Altering queries?

[K J]

  It sounds like it'd be cheaper and allow you to make better use of cache,
so I'd assume it's good.

>
>
>
> Being able to rely on a cache will impact your design and will generally
> be good.  I do some things very similar to this that involve grabbing some
> list-like data, and then fetching items related to items within the list.
>  As many as I can get come from cache, and the rest have to be fetched from
> the source, and then placed back into the cache.
>

How about storing the list of the user's friends in cache also?  The only
problem here though, is what if the user has tens of thousands of friends,
for instance?
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