- Browser plugin that lets you have private group conversations around other peoples' posts. Pure evil, I won't do it due to pesky ethics. (Think "people gossiping about how ugly someone is in their selfie behind their back" as primary use case.) UX would be injecting thread inline on major sites, first would obv be Facebook.

- Better wedding planning software

- Tool to go through LinkedIn "Who You Might Know" recommendations to assist in job hunt