There are many types of dad bloggers. If you agree with my opening comment in my blog Does Every Dad Blogger Have an (Un)hidden Agenda? that every blogger DOES have an agenda, you could easily argue in favour that there must be or there is a very strong suggestion that something may have been the catalyst for each Dad Blogger.
Did having a divorce become your catalyst? Was the birth of your special needs child the basis of your motivation? Were you already a gay blogger who adopted a child and so started your world of dad blogging, with the emphasis on being a father of a child while being in a homosexual relationship?