Automatically fill the default vocabulary term associated with a content type when editing a node What I'm trying to do is to automatically select the default term in the "add content" page based on the user's location in the site.

Example:
User is currently viewing classifieds listed under "Los Angeles", which is in "California", which is in the "Locations" vocabulary.
I want to automatically set the default value of the "Locations" vocabulary shown in the the content form for new classifieds to the term that identifies the area they are viewing.

Is this possible?

NOTE: I'm not referring to GeoIP or locations-based modules. I'm just looking for a way to automatically select the term they are already viewing, and use it for the node being created.
I think the answer will be to make your button/menu item dynamic using arguments from the URL. It sounds like when a user clicks the "Add Classified" they are already viewing the classifieds tagged with a particular location taxonomy term. In which case, I'd imagine that term name (or id) appears in the current url, something like http://yoursite.com/classifieds/LosAngeles. If so, I believe you can pull that term out of the url and use it in your link, something like http://yoursite.com/node/add/classified/LosAngeles. Then, you'd need to alter your 'Add Content' form to pull in the term from the url (the LosAngeles part). This should work in theory, however I'm not sure exactly how to do that in practice. I'll see if I can figure it out before you end up answering your own question, but that should at least help point you in the right direction for now.