SUP will not work for Twitter or any other service that deals with
very large data sets.

In essence, a Twitter SUP feed would be one JSON array of all the
Twitter users who have posted a status update in the past 60 seconds.

a) The SUP feed will consistently contain a few million array entries.

b) To build that feed you must do a select against the tweets table,
which contains a few billion records, and extract all the user ids
with a tweet that has a published time greater than now() - 60. Good
luck asking any DB to do that kind of select once every 60 seconds.

Dewald

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