Ask: I develop Facebook applications. How much should I charge per hour?

JavaScript is a high demand market right now with a restricted supply of talent. Most experienced JavaScript developers are charging anywhere from $80-$200hr depending on location and experience.

You're working on a startup, so you should be valuing your time at about $1000/hour (said something posted here on HN a while back).

http://blog.asmartbear.com/value-time.html

Jason Cohen (CEO of WP Engine) is the one who mentioned $1,000 / hour in a blog post in January.

well, I need the money now. It will take another several months until I'll be able to monazite my application.

It's not too hard to find reasonable PHP / JS devs for Facebook apps at around $50 an hour.