its not a matter of caching the tweets, per se - its a matter of storing extremely sensitive information for the long haul. we intend to provide this information on a long-lived-basis at some point, but until we have better privacy mechanisms in place, we are not going to be storing this information at all after the hard expiration date.

I assume you're caching the tweets in a local DB or something in order to provide histories of > 3200 tweets. For now, can't you also just cache the geocode info?


On Tue, Sep 29, 2009 at 12:11, jim.renkel <james.ren...@gmail.com> wrote:

As an alternative to a hard coded 7 days for the interval to the
removal of geocoding information from a tweet, I suggest that an
optional "expires" parameter be added to the statuses/update method.
The value of this parameter would give the number of days between the
tweet creation and when the geocoding would be removed from the tweet.

The default value of the parameter, i.e., the value used if the
parameter is not present in a statuses/update request, would be 7, in
conformance with current policy.

An explicit value of 0 would indicate that the geocoding information
is never to be removed (But see below.).

You may also want to consider a new method that removes the geocoding
information from an existing tweet, even if the interval was specified
as 0. Obviously, irreversible, like deleting a tweet, and could only
be done by the creator of the tweet, like the statuses/destroy method.

Comments expected and welcome.

Jim Renkel

On Sep 29, 12:42 pm, Raffi Krikorian <ra...@twitter.com> wrote:
> > I just noticed this in the API wiki, under the statuses/update method:
>
> > "Currently, all geolocated information will be removed after seven
> > days."
>
> > Two questions:
>
> > 1. What exactly will be removed: the geocoding attached to the tweet?
> > Or the whole tweet?
>
> the geocoding attached to the tweet.
>
> > 2. Why? I.e., why remove the geocoding or the whole tweet? I can think > > of many use cases where it is important for the geocoding to remain as
> > long as the tweet remains. For example, I take a great vacation
> > picture, upload it to Twitpic, then tweet about it, including where I
> > took it. The location where I took the picture remains the same
> > forever. Why delete the geocoding information from the tweet, or the
> > whole tweet. This will just cause folk to put the geocoding
> > information in the text of the tweet, taking up valuable space and
> > reducing the value of geocoding tweets, and cause developers (Like me, > > admittedly) to develop applications that put the geocoding in the text > > of the tweet. With applications like that available, twitter users are > > less likely to go to the botther of opting-in to twitter geocoding of
> > their tweets.
>
> this is being done for privacy issues, and in the future data will be > kept for longer once more sophisticated privacy controls are put into
> place.

--
Raffi Krikorian
Twitter Platform Team
ra...@twitter.com | @raffi




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