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We're working on some changes to our site and want to add a site map file to give some hints to search engines on our member profiles. Our site has millions of member profiles. I want to ensure that Google indexes them. Is there a benefit to submitting millions of profiles across multiple site maps? Is it better to pick a sample of those and submit them? Most member profiles have links to other member profiles. Is there any benefit to taking a single site map of 50k links and then changing it at some frequency so that all of the member profiles are eventually indexed? Thanks.

I'm in the process of adding some new features to our site and have a question about our URLs. Most of our URLs consist of either sitename.com/contentname or sitename.com/content/contentid I'm in the process of building a directory to those pages. The directory has a number of filters which will ultimately point to the destination page. sitename.com/filter1/filter2/contentid or sitename.com/filter1/filter2/contentname The destinations will have references. From an SEO perspective, I would think I want the filter1/filter2 version of the link indexed since this will add keywords that someone might search for. However, since the filters are dynamic, if someone just searches for contentname I would want to have sitename.com/contentname returned in the search results. Do I get any SEO benefit out of building those filter links as described if they are not the canonical links?