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URL submissions to the site are algorithmically checked and not manually checked except for a few cases.
However I do see reports on submission failure rates and there have been a lot of sites submitted that are rejected by the search engine because of too many ads or too many popups or popunders.
If a surfer visits your site, clicks once and then has a popup take over their screen then your site just won't be included in the index. Likewise if you have more than 4 ads above the fold then your site also won't be included in the index.
The key decisions of whether a site is included on Node.XXX are:
1. Does the site provide a good user experience ? Good
2. Does the site have too many ads ? Bad
3. Does the site have takeover popups on click ? Bad
4. Is the site spammy ? Bad
5, Does the site embed large amounts of content from other sources ? Bad
6. Is the site a white label ? Exclusion
7. Is the site an embedding tube ? Exclusion
8. Does the site have too many spammy links pointing to it ? Bad
9. Does the site have malware or unwanted redirects ? Exclusion.
10. Does the site show different content to mobile and desktop users? Exclusion
Even if a site is included in the index, every time it is re-crawled these considerations apply. We also check the site from proxy nodes using various User Agents to be sure that sites aren't trying to fool Node.XXX
So to sum up. Good user experience and original content will see a site included in the index. Bad user experience or spam etc will see the site excluded.
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