Welcome to the Q&A Forum

It might likely play out sorta the way links do--deep content/less linked-to content/old content equals less-crawled content.  Maybe you could have 1,000,000 authors on a site but the ones that derive the most value from it are the most recent, the ones on the most active pages, the ones on the most linked-to pages.

Hi Andrew, As far as I know, Google stopping crawling URL when it finds # in url ( correct me if i am wrong). For example, Please type "inurl:# " in Google, you will not get any result. Hope this help you....

Just some quick ideas for you Firstly i cant get to your facebook etc pages from site - i can only like etc . Leverages your audience-  i would do something for links with a strong blog or site who wants to get infront of that big social audience of yours. Have them create content for you to put on your site that might attract attention and links. Have them Share and spread the love links will follow

Thank you!