I want to know the answer to the following question:
On what date did the PlayStation Plus service officially launch?
All the background I'm provided with is that "Launched alongside PS3 firmware 3.40 and PSP firmware 6.30 on June 29, 2010, the paid-for subscription service provides users with enhanced services on the PlayStation Network, on top of the current PSN service which is still available with all of its features.". Is that enough to answer the question?