MSN, Yahoo & Google all have single-sign-on services to tie their properties together. If you have an account on one service, you don’t have to fill out a ‘new user’ form on any other XXXXX-owned site. IAC doesn’t have a single-sign-on service, but they desperately need one. Also, it’s a great opportunity to put the IAC logo out there and have it become a known symbol of quality internet websites. If you see a single-sign-on widget on ticketmaster, ask.com, match.com, pronto.com and others and you stumble upon some tiny other IAC site, you may not want to join it, but just seeing the familiar single-sign-on widget gives the user a warm-fuzzy that this site is part of a larger family of trusted sites. It almost seems like a no-brainer and could be implemented by a php programmer in a few hours. How come this isn’t being done?

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