The folks that administer SCN indicated that they have experienced a significant number of spam attempts through SCN accounts recently, As a result, "[m]oderation has been enacted for any personal blogs and for newbie contributors (those with less than 30 award points of participation)".
If you have less than 30 reputation points and your posts don't appear immediately after you submit them, please be patient. They will appear, they are just being reviewed by SCN moderators.