All external basically. If you look at the Curator picks feed, the last 15 or so posts are what I've selected so far, to give you an idea.

SEO friendly is nice, but anything external as I'm also tweeting out most of the posts, and a retweet from a project account drives a lot of traffic. For example, this tweet of a post by @bluerobo about Koinos was retweeted by the project, and brought 50+ visits to Leofinance from Twitter. Those are the kind of results I'm aiming for.