Apart from the Warbook and other game related apps, I found some 3rd platforms as written below to be extremely useful and cool to use;

-Ebay (for my auctioned ebay items)
-MyFlickr (which displays your photos from Flickr)
-Photos (you can tag yourself/friend's photo in single photo and it will automatically shown in your profile, even if its your friend's photo)
-Second Friends ( i play second life, so this is fun)
-Top Friends (like Friendster, I can choose my top friends AND send variety of cool drinks to your friends)

Friendster is all about testimonials, groups...and pretty much nothing else since I've added Facebook as my social platform.

If you work in international agencies/companies, you can add the network you're working in and be able to add colleagues from that company. I've my boss and some white dudes I've worked with, haha. A lot of Europeans and Americans in Facebook since its the No 1 social networking platform this time around. Some companies in Australia had banned Facebook during working hours, imagine that!

Just register Facebook and get ready to be addicted to this platform. If friends is the prob, then just invite them by using 'Friend Finder'. You'll be amazed on how many of your friends who have joined FB.