Not all new Blogger blog owners understand why they are asked for their birthdate, when they setup a Blogger or Google account. Some folks see this as a violation of their right to privacy, and enter a fake birthdate. Some real serious privacy enthusiasts might enter "01/01/01", just to get through the setup process - maybe intending to correct it, later. Nobody entering "01/01/01", for one's birthdate, suspects that claiming such a birthdate makes them - in 2013 - appear to be 12 years of age. Unfortunately, 12 years is below the minimum age for owning a Blogger blog. Since Blogger / Google tries to protect the young people on the Internet from inadvertently exposing themselves - or their families or friends - to unknown dangers, people who may appear to be of insufficient age are subject to having their Blogger / Google accounts, and Blogger blogs, deleted or locked.
What Blogger won't tell you