Hi, I am saving information regarding the users of my gadget.
I have a procedure where I need to get information about the user
friends who are also using my gadget.
a. Is there a best practice for this issue?

b. I want to aggregate the data, I've read about the counting methods
in BigTable, but they seem to work for data that you know from the
start.. In case of user friends, it can vary on a daily basis, as well
as totally dynamic (I currently retrieve the friends list via the
python-client project in Google code)... How can this be done, without
iterating through the list and fetching the user entities from the
datastore (and even if that's the only way, won't this fetching cause
bad performance?

c.How common is the use of ListRefrence in BigTable, and is it known
to be good?
I have a DB model who has only 20 entities... But I like the back
reference it creates for me
(Instead of implementing a counter for each entity)
But after digging and reading about the uses of BigTables I think that
the more references you have, less performance you get...

Please help,
Chen.
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