speech ideas for a competition?

[Abhinav]

I want to start with a speech which is a competition level speech at the world level.
The speech should have a message, should be unique , people should be able to relate to it and it should leave a lasting impression.
Any ideas about what can i write cause I am not able to figure it out

[Dennis]

G-Zero world
censorship of social media sites
what's the future of South Sudan

[longknowledge]

If I were Barack Obama.