Nifty, I may be worng, so correct me if I am.
My understanding is that the ads, when you are logged in, are custom chosen for BYC, relating to all things poultry and their care. Most, if not all, are from BYC sponsors.
The ads that appear when you are not logged in are chosen by google and are often customised to your specific computer.
For instance, I was truck shopping online a while back- lately I see more ads for car/truck dealerships in my area. If I search for gardening questions, I get more ads for seeds and gardening supplies. If I look at RPG sites, I'll get ads for them.
Basically, whatever you look at online is going to be tracked and eventually show up to try to entice you again. I used to be an Office Manager/Admin. Assistant. I could go to ANY computer in the many offices and know exactly what people were doing when they were supposed to be working by looking at the ads that popped up in their browser. I didn't have to look at history or anything, just google something or see their facebook page. Sometimes it was uhm......erm....... enough to get them a major warning. One time I actually put a parental block on a guy's computer!
Oh, and another thing- if you're at work and the company's comps are networked? Whoever is the admin can see exactly what you're doing online without leaving their desk!
