I woke up this morning and found 20 messages from Facebook in my email. I shrugged it off as “Facebook Spam”, as some other people have been telling me they’ve been getting unsolicited messages on Facebook. I didn’t bother to log on to check the messages.

Later in the day, I logged on only to find that they weren’t spam at all. They were all comments and suggestions on the Mood app that I made for Facebook. It turns out that yesterday, Facebook added my Mood app to the official applications directory. Overnight, over 4,000 people added my app. By my rough estimates, it seems to be growing by about 20 people per minute right now, and I expect to reach over 10,000 people by tonight.

Currently, it’s easily overtaking the neighbors in the ranking list, and I think this is due to how viral the Mood app is. It’s a dead simple application that adds a bit of customization to your page that is familiar to MySpace and LiveJournal users. I really believe that it’s simplicity that will win over these other complicated applications.

Things that I’m planning on adding:

• More moods.
• Instant updating right on profile page.
• Custom moods.
• Custom pictures for moods.

Any other ideas?

I created my first Facebook application: Mood. You can now alert your friends of your mood. Add it and tell me what you think.

The overall experience wasn’t too bad. Facebook really opened up their API in a deep way. You can access almost everything that internal Facebook developers can.

I just submitted to the application directory — we’ll see how it goes.