Hi,
SCN was under attack over the past few months and was flooded with thousands of spam posts created by fake user accounts. This required the start of moderation for public accounts. After some beginner missions are completed, you'll be able to post freely and without moderation (99% of activities).
This is not the result of the gamification launch earlier this month; however, the gamification system is being leveraged to calculate the completion of the beginner missions and verify users.
See http://scn.sap.com/docs/DOC-41597#Moderation_Approval
Sorry for any inconvenience.
Jason