SpeakingX

This is the list of modules I am using for building a social networking site (http://ispeakx.com). I avoid using "Top Drupal Modules" here as it's quite vague to me.

Please note that these modules are all contributed modules for Drupal 5.7. You can find my experiences with some of these modules either on this site or at http://speakingx.blogspot.com

 "Core" modules besides Drupal's core modules

• Views
• Content Construction Kit (CCK)

Core social networking modules:

• Organic group
• Event
• OG Calendar
• privatemsg
• Buddylist
• Answers 
• Organic Groups Mandatory Group

User profile:

• Bio
• Automatic Nodetitles
• CCK Taxonomy Fields
• Link
• Date
• Fullname field for CCK

SEO:

• Pathauto
• Global redirect
• XML Sitemap
• Google Analytics 

I normally also install Page Title Module and Nodewords (Meta Tags) Module , but don't expect your users care for these things.

Misc

•  

• Voting API
• FiveStar
• Token
• Taxonomy Batch Operations/taxonomy_xml
• Content access
• Front Page
• userpoints and related modules: also pay attention to this author's other modules. 
• Tagadelic
• Activity
• OpenID become core in Drupal 6
• Digg this
• Service links

Monetization

• AdSense
• Adsense Injector

  All the modules here have been installed on my site (but not vice versa), and appear to work properly (so far:-). This list may change along with the development of my site. I'll try to bring you the latest update.