The exchanges held an engagement party at the industry's March conference in Boca Raton.

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Most American sock exhibitionists, on the other hand (or foot, as the case may be), look like victims of holiday office-party gift exchanges.

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Income and sales taxes create an obstacle or barrier to such mutually beneficial exchanges by reducing what each party gets from the other.

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Mr Hurst said his computer had been hacked by a "Trojan horse" - a programme in which harmful code is contained inside apparently harmless data and allows a third party access to email exchanges.

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Campaign data gets pushed through third party intermediaries, ad networks and exchanges, demand side platforms and more.

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The future of Scotland's police service then dominated the exchanges between the first minister and the major opposition party leaders.

BBC: First ministers questions

Plaid's Dafydd Elis Thomas is staying away, defying his party's three line whip, sharing "full and frank exchanges" with his group and expecting the sanctions and the trouble that has been a long time coming.

BBC: 'No conniving' and 'no conspiracy'