Hot or Not became a dating site, so make this a site for rich people (or rather show-offs / aspiring rich) to connect? Maybe there's a security issue flaunting so openly?

Can also focus on people in their favourite fashion brands, or people wanting to sell shoes / clothes / jewellery. Users can locate others by their clothing size and find their better-dressed doppelganger.

Why not have a free-tier signup or browse-only?

Make it about sub-cultures or "people of the sub-reddits" and tie it in with reddit posts/karma.

How about HN users and their crazy systems or exotic locales? Musicians and their horns? People and their pads?

How about a bling-rotation site? There are sites for crystals where people get new ones each month and send their current ones off. (crystal rotation subscription) Keep it fresh!

You send me your keyboard and I'll send you mine!

Bling rentalz?