facebook in last 3 years gone from a milion dollar valuation to 15 billion.

Google has its grudge against Facebook, microsoft has invested and created a high valuation and facebook potentially launching a ad service with better user preference knowledge than its old adsense platform

facebook is growing and has a mindshare of top 16-30 year olds, the youth whom every advertiser targets.

Facebook app development is not easy, no ajax, fancy UI for now, but as a innovator and a great developers dveloping facebook and facebook apps they can overcome those.

if google had to team with up everybody to compete against facebook and facebook application developers then facebook has been able to achieve what it intended to.

but over time expect opensocial to add other API besides current widgetting capabilities as they dont want to look like a cheap imitation.

also I suspect google would be writing some intermediate code for interfacing developer apps with other opensocial sites.

most of this communication would be via REST and JSON

for developers and development companies like ours we would put our bets on apps/sites which give us better revenues and development oppurtunities. we would continue with facebook apps and may port some to opensocial if demand exists