How to improve indexing of virtual subdomains?

Question

Google

Hi all! Share your experience on how to improve the indexing of virtual subdomains? For each registered company, a separate subdomain is created with its own internal links (the matrix is ​​the same for everyone), but in general, just like here on Habré for each user. For the main domain, I created sitemap.xml, I write reviews on forums and other goodies. But what to do with subdomains?

Answer 1

On the subdomain of each company, automatically display links to other companies in the industry (rating, for example).
On the main domain - a structured catalog of companies with links.
Give companies the ability to link (search and select from the database) to sub-demands of partner companies, there will be links to companies that are not necessarily related by field of activity and there will not be as many of them as links to other companies from the same industry.
Of course, the number of links should be reasonable, logical both from the point of view of readers and from the point of view of search engines.
Good luck.
PS You can automate the insertion of links to the mention of companies in the text of the news (no more than 1 link-mention in one article), links, of course, to the sites of companies registered on the service.

Answer 2

Thank you!