Re:Facebook’s Clear History privacy feature is still months ...
by chillacy on Thursday December 27, 2018 @10:34PM
(#18774721)
> I have no idea what we are even discussing.
Yea I figured. I'm not talking about Facebook at this point, this is a general engineering comment.
My point with the modeling comment is that the might not access it by individual, because models can be trained on statistical averages and time-ordered instead of by individual. Also the models are trained offline (meaning not in real-time).
If you have an analytics table sitting in HDFS ordered by timestamp and you want to produce a realtime UI for users, that'll take some engineering work, right?
What do I mean by ‘Facebook tracking individual user behavior’? Um... I don’t know what to say to that. What a strange question. It’s pretty clear what is meant by that. It’s the primary focus of their business.
Next, “usually when you train a model you extract features for each event and then you apply your model at prediction time”. That’s nice, but when did we start discussing ‘training models’?
Facebook has a list of internet activity. It’s stored by user. They’re in the business of selling personal data. Nothing you said has anything to do with that. I have no idea what we are even discussing.
Whether someone can make an ad hoc a query by user is completely not the point and has nothing to do with anything. I would assume that they have extracted the information into other reports or data stores, obviously, not process trillions of lines of entries whenever they want to access it by individual.