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We've spun out content from a single finance related news/analysis site (running for about 2 years) into several topic-specific sites on individual topics (markets, investment etc etc).  They're all on the same server, use the same CMS (using a multisite setup), and share largely the same codebase, though obviously with customisations for the site names, and we've made sure each has a distinct identity. At the bottom of each page, we're linking to 'latest posts on the network', aggregating the 5 most recent posts from all the sites and displaying them in the footer.  We've obviously made sure the actual content is completely unique on each site though. Just wondering if anyone has any tips about ensuring we don't dilute our SEO too much. and how to maximise our effectiveness?