A Slice of Tweets

I saw my buddy Dave Delaney talking about how to create a twitter mosaic and I thought I'd give it a try. I have no clue how they choose who to include. I just put in my twitter name (@cc_chapman) and it brought this back almost instantly. I'd love to know what the algorithm behind the scenes is that pulls this. Anyone from the company care to share? I'm just curious

The Cost of Free

Vanity Fair Social Media Issue?