This year, nearly half a million children will be born with HIV.

By 2015, that number could be zero. Imagine it — the first generation of children in 30 years to be born without HIV.

When this disease first began ravaging societies around the world, the Internet as we know it was a mere infant, cellphones cost $4,000 and the idea of an open, global exchange of information with the tap of a few keys was just a dream.

Now, a Tweet can reach millions of people in seconds.