Google Alerts Question

[seoasps]

How does Google Alerts work? And why does it only pick up a few of the web-pages on my website but not others? I've realized that I have posted things on blogs, or other web references that link back to my site, but through Google Alerts, maybe only 1/20 get picked up. What is the difference between the alerts that get recognized and the ones that dont? Can anyone help with this?

[Jason]

Other people have this problem.

http://bhc3.wordpress.com/2009/01/20/google-alerts-aint-working-why-arent-they-using-attention-signals/

I don't know what you are posting but I would assume Google judges what you are posting as either not relevant or not important enough..