One reason I take these is that I have RAM and I have grep and apparently either the people who had the data don't have RAM or they don't have grep, and so while I can ask my local Facebook archive "Er, didn't I write something about anti-freeze?" and get an answer in seconds, Facebook itself will try to suggest I might want pages about anti-freeze, a group that cares about anti-freeze, a sponsored advert for anti-freeze ... and not the thing I wrote.