For several years now, I can’t say exactly how many, the leading search engines have changed the issuance algorithms. Everyone wants to get into the top ten exhaust, and it's quite difficult. I will say that the search engines even use manual selection of sites in the issue. The fact that the exhaust is individual, it is, the selectivity goes to advertising, if you are interested in means for dyeing hair, you will not be shown toys in advertising. In the issuance, the region of the request, old requests from the user, and last but not least, the quality of the issuance - the coincidence of the request phrase, the topic, the novelty and authority of the resource on which the information is located, its spamming, and so on. Damn, today we turn on the anti-aircraft alarm every half hour, and at night, too, the "brothers" got it with their activity. Today they hit a high-rise building in Kharkiv with an S300 or equivalent, broke through the roof, one was wounded, this is in the neighboring area. War is psychologically very tiring.