Blog Ping:
This one is quite old, but still widely used. Blog indexing services setup a protocol in which a web site can send a ping whenever new pages are added to a blog. They can then send over a bot that grabs the page content for indexing and searching, or simply to add as a link in their blog directory. Black Hats exploit this by writing scripts that send out massive numbers of pings to various services in order to entice bots to crawl their pages. This method certainly drives the bots, but in the last couple years it has lost most of its power as far as getting pages to rank. Still
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