Facebook's Activity Log, which tracks everything you do on the social networking site, just became even more comprehensive. Facebook has added the ability to see all the searches you have ever made on Facebook, providing an insight that is simultaneously weird, enlightening and very disturbing.
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The feature is being rolled out gradually, so it may take a few weeks to see it (no sign of it on my account yet). As well as checking out searches you have made in the past, you can also delete them, which might be one way to make the ads which appear on your Facebook page less ridiculous (though search is only one of the drivers for Facebook advertising).
Facebook's announcement post emphasises that the Activity Log isn't visible to any other Facebook user. Consider it another reminder that Facebook logs a lot of data about you, and your control over that data varies.