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Facebook just announced their long awaited 'Clear History' tool -- tho it only really lets you 'Disconnect Activity'
(and even then its pretty limited)

PR release:…

Fact sheet:…

Technical writeup:…
1) 'Clearing History' doesn't actually delete your data, it just 'unlinks' off-Facebook it from your profile but maintains it in pseudonymous form.

Experts like @random_walker and @yvesalexandre have shown this type of data is easily re-identified.
2) For 'cleared users', @Facebook will then create pseudonymous identifiers called 'MID' to still allow conversion tracking/measurement

They won't know its 'Ashkan' that the ad, but they'll be able to tie past behaviors (ie ad views) to that click.

Again, not really 'anonymous'
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