It had better be interesting. That idea you want to sell to a world class future technical co-founder. Because he/she is likely already knows the interesting bits of working at scale, and will need to believe that she can get them back (but done better this round, of course!) through your idea and leadership. And the bits probably are a mix of tech, culture, and management.

Craigslist and college campuses smell of desperation. Which is hardly a good start to a company. Hiring and recruitment are a first order skill for a founder.