Справка Google, опыт и здравый смысл Первого больше.
Малыш
Что имеется в виду под «географические факторы»?
http://www.copeac.in Кролик Роджер
Есть такая интересная штука в AdWords:
Also, google analyzes and parses the actual search query the user types at google.com. If someone enters a search query that contains a city or region, they may show related regionally targeted ads. For example, if someone searches for «florida widget», they may show relevant ads targeted to Florida regardless of the user’s physical location. Also, if someone searches for «widget» from a Florida area IP address, they may display ads targeted to Florida, even though Florida wasn’t in the search query.