How Does Google decide what adds to place on a page

The mystery of Adsense Targetting

[steve40]

There are many discussions regarding how adsense does it's targeting,
and many new webmasters wondering why adds don't match content, so I thought
I would write some of the metrics which "I think" but not know Google uses

The first 4 are possible metrics which G uses for a new page

1. Account Trust
( are there earlier issues )
2. Site Trust
( this does not mean only sales could also include earlier visitors time on advertisers site after clicking)
3. What the site is about
( possibly from home page or links to home page )
4. Any G SE Algo penalties

So for a new site from the list above the adds could be low paying MFA's from day one
and possibly mix in better targeted adds to gather data and improve site / account trust.

For a well trusted publisher with a well trusted site adds may well be targeted well almost instantly
using all of the above.

only my own thinking would be interested to hear from some of the other senior members how far out I amd and what I have missed

steve

[jomaxx]

Don't agree with #1 or #2, although there may be a process in which Google learns which cpecific ads get the most clicks from which specific sites.

Definitely don't agree with #4. In fact I have a secondary site which is banned from Google's search engine (duplicate content; it's basically a mirror site), but gets great ads.

I would look more that the way Google zooms in on keywords on the page, in order to match them to the terms advertisers are bidding on.