However I am surprised that you have not mentioned in this post or the original one that apart from the content generation idea the site architecturally is about as un web2.0 as you can get. I am not just talking lack of RSS feeds here, because of the framesets I cannot even bookmark a link to and individual video. Having been ‘spoilt’ by modern expectations of how a website should work, fundmental problems like this render Ecpod unusable for me.

As for Praxis I am awaiting the German one to give it a run for its money again.

I appreciate the post. We tend to see 2 types of social networks: people-centered (think Facebook) and objected-centered (think Flickr).

People-centered networks, such as LiveMocha, iTalki, etc tend to focus more on connecting people first and then layering in learning materials. We have taken the object-centered approach by putting out learning materials (lessons, grammar, vocab) at the core of our service. We believe this is what will attract a loyal vertical community of students in the long-run.