If you have their details,
their details so that you can tirelessly spam the fuck out of them
( the mighty badger Aphrodite, on a bar stool, by your side, Wed 21 Nov 2012, 12:04, 1 reply, 12 years ago)

I'm by no means an expert
but I've always assumed that "custom" was a knowing contract by both parties to exchange goods/services for currency/commodities.

Personally, and this is only a personal opinion, I wouldn't have thought that cookies and contact details count. You don't have an option over cookies aside from avoiding the website altogether and, unless they've bought something or signed up for something, you shouldn't have their contact details.
( Kroney, Wed 21 Nov 2012, 12:07, Reply)

I was not disputing this particularly
I was just subtly moaning about spam.
( the mighty badger Aphrodite, on a bar stool, by your side, Wed 21 Nov 2012, 12:09, Reply)

I like the story about the email spammer
whose house address was discovered by internet people and they started signing him up for physical junk mail.

He tried to get a court injunction and the judge ruled "fuck you, I hate email spam".
( Kroney, Wed 21 Nov 2012, 12:11, Reply)