People often seem to have trouble working this one out. Just find my email address, it's dotted around the internet in various places if you look it up. It's zoom_zoom_ben and it's a UK Yahoo account, you can work it out from that unless you're an evil blog-scanning, email-address-harvesting computer.
I tend to ignore people who add me as a friend on Facebook if I don't know who they are and they don't leave any kind of message (actually, I sometimes ignore people I do know, who do leave a message - I quite rarely get round to visiting Facebook and updating my friends list). Also, please don't send a message to the other Ben Pridmore on Facebook and tell him you're a big fan of his memory skills, because he doesn't like it. And you definitely shouldn't add me as a contact on LinkedIn - I joined the site because someone told me to, years ago, never did anything with it and now I've finally deleted my account. Nor should you really contact the World Memory Sports Council, or the Alzheimer's Society, or anyone else I've been vaguely associated with in the past and ask them to pass a message on. It's much easier to just find my address and drop me a line directly.
Oh, and it's a really, really bad idea to find my phone number in the phone book and phone me. I'm never in, and I never listen to my messages. Also, I hate phones.