Google only shows a "sample" of the links they know about using the link: operator. Sometimes that sample is none. Also, don't forget to include the www in your URL when checking on Google, if that's your preferred URL.
Doing a linkdomain: search on Yahoo I'm seeing 245 total links. If you "exclude" the domain itself, there's less than 100.
Work on external links and patience.
patience is the key, but it does take a long time.....
Hard question to answer. Really depends on the website. Please check out this thread:
Link Baiting and Social Media Optimization, Huh? - Jaan’s Search Marketing Blog - Toledo, Ohio
Test your site with this tool. Was always accurate for me: Strongest Subpages Tool