Social networking service Foursquare has made a common mistake: it allowed its domain name to lapse with registrar GoDaddy. It is unclear whether this was because Foursquare maintained inaccurate WHOIS information, or whether its credit card had expired, but this is unfortunately a common issue.
It is important to insure that your domain name's WHOIS information remains current, accurate, and complete, as the failure to maintain this information could result in the loss of your domain name. If you have acquired trademark rights in your domain name, you may be entitled to recover it under the Uniform Domain Name Dispute Resolution Policy or the Anticybersquatting Consumer Protection Act, but many times a party has yet to acquire trademark rights. That is why it is important to diligently maintain your domain name portfolio, including your WHOIS information.