What's next in *social* Internet?

Social media seems to be a hot topic but with a lot of tension from two aspects:

(1) There is a lot of talk about developing and delivering more in social media.

(2) There is not much clarity about just how to have more in social media or just why to have it.

Here are two examples of some of the recent talk about social media:

First, here on HN is the thread:

"Sergey Brin: We’ve Touched 1 Percent Of What Social Search Can Be (techcrunch.com)"

at

http://techcrunch.com/2011/01/20/sergey-brin-weve-touched-1-percent-of-what-social-search-can-be/

So, what is the other 99%?

Second, is the thread "Building Better Social Graphs" at Fred Wilsons blog A VC* at:

http://www.avc.com/a_vc/2011/01/building-better-social-graphs.html#disqus_thread

with a lot of relatively good relevant comments.

So, in social Internet, users connect for what purposes?

Then how can we use data on social graphs and some techniques in social search to help achieve these purposes?