I have a wordpress site. If I include some javascript on a post, I show ads on the post. I want to only show that javascript when people come to my site from google search (as opposed to from twitter or facebook -- or by going to the URL directly).
Is there any way to do that from within wordpress?
Not a wordpress questions really. You will get much better responses at stackoverflow.com. However you instigated my curiosity... you can get the referral url by using the following javascript:
document.referrer
You could add that to your current AD script to check if the document.referrer == "some url" before displaying the ad.
See more examples here
