World Cup-bound All Blacks are on notice to think twice about what they post online during the tournament, with assistant coach Ian Foster labelling social media "an absolute trap".

The All Blacks head to Japan in their bid for a third successive triumph tomorrow.

Their every move on the playing field will be tracked and commented on by scores of rugby fans back home.

And so too will anything they post on social media.

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Foster said players were very aware of what should and shouldn't be shared online.

"Social media is an absolute trap in sporting environments because people are

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