Always expand it.
And pay to click or paid to click are usually money making scams. Sadly this means you are usually in a shadowy area rather than selling your real stuff or ideas.
Since this is one of those topics, this discussion is declared a link free zone.
What do you think witch PTC script better then others?
Why?
The reason??
The development of such sites?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic