One is general entertainment (think 16 - 24 demographic, male, using 4chan and facebook). Although it's got a USP, during the time spent coding the competition has increased (which I view as a positive). I do have an edge but it will take time to build user base and to drive advertising money.
Other one is SaaS aimed at power-users of one particular global social media channel. Senior marketing specialists, PRs and similar type of folk. Very innovative tool, narrow niche, big subscription price. This one has a better short-term cash generating prospect compared to my first startup.