Apply that theory to the upcoming election in this country, and even though a dinner with Bill English or Andrew Little's unlikely to have them rushing to the dining room, the principle could be applied when it comes to advertising.
Data mining is now very much part of the lexicon in this country where a solo mother with, say two children, can be directly targeted for her vote through data collated without her knowledge.
And political parties here are turning more to social media to get their messages across and who can blame them with an abysmal turnout of young voters, the most common cyberspace users, and with 60 percent of Kiwis visiting Facebook every day.
The rules for election advertising have changed this election with none of the boring opening statements from parties on radio and television and with more of the advertising dollar likely to be spent on social media, at the direction of the parties' teams devoted to the cyber highway.
If you look at who's the most successful on Facebook John Key remains well out in front with more than 246,000 followers. The current political incumbents by comparison are also rans with their popularity reflecting their preferred Prime Minister opinion poll ratings.
Bill English comes in with 99,000, Winston Peters on 81,000, Jacinda Ardern at 58,000 with the hapless Andrew Little coming up the rear on 34,000, a thousand behind Gareth Morgan!