Facebook Connect is the next evolution of Facebook Platform - enabling you to integrate the power of Facebook Platform into your own site. Enable your users to...
* Seamlessly "connect" their Facebook account and information with your site
* Connect and find their friends who also use your site
* Share information and actions on your site with their friends on Facebook
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Communicate your ideas powerfully using Adobe® Acrobat® Connect™ Pro web conferencing software. Securely share presentations and multimedia right from your desktop, and get feedback from hundreds of participants — all using a web browser and the Adobe Flash® Player runtime, already installed on 98% of Internet-connected personal computers.
A.K.A umConnect. This used to be known as Macromedia Breeze Meeting.
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Google Friend Connect means more people engaging more deeply with your website -- and with each other.
* Enrich your site
Choose engaging social features from a catalog of gadgets by Google and the OpenSocial developer community.
* Attract more visitors
Your users can easily invite friends from social networks and contact lists to visit and join your site.
* No programming whatsoever
Just copy and paste a few snippets of code into your site, and Friend Connect does the rest.
Here's an article about facebook connect vs google friend connect. http://mashable.com/2008/12/05/facebook-connect-vs-google-friend-connect/