This isn't my cup of tea, but we'll see... I can hear Jim typing away, he might be a better bet.

Slide wasn't ready for the scale of facebook engagement. they learned

break down your application

• static content
• application logic.
• data storage

offload static content.

• CDNs (Akami, panther)
• storage solutions (S3, facebook coming)

optimize your application logic (again, myspace is self expression, facebook is sharing, so people will move data around at a rapid pace as the ap grows in adoption)

• pagination
• ajax - we're used to people go through pages. on facebook ppl go to a page then leave. so it can help the user experience.  ajax allows you to have isolated logic you can extend very easily
  
• caching (memcached is your friend) People get mad if you dumb data, you have to keep it around but you dont' want too many data call

simplify data storage

• normalization
• indexing
• Keep is simple

test your application

• listen to your users
• QA, usability, desirability -- go to the forum and someone will tell you how you messed up
• Watch your logs
• create big test accounts
  
• something that works with ten friends breaks at 100, 800, more... don't underestimate friend size _design for scoble_
• Measure activity

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