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apparently, this is how according to yahoo.
* Go to your Facebook account's privacy settings.
* Click on ‘Customise settings’.
* Under ‘Things others share’ you should see an option titled ‘Suggest photos of me to friends. When photos look like me, suggest my name’.
* Unfortunately at this point you can't tell whether Facebook has enabled the setting or not, you have to dig deeper.
* Click on ‘Edit settings’.
* If Facebook has enabled auto-suggestion of photo tags you will find the option says ‘Enabled’.