Hi there!
For our inbound links, here is how we compile our index:
<code>- We grab the most recent index.
- We take the top 10 billion URLs with the highest MozRank (with a fixed limit on some of the larger domains).
- We start crawling from the top down until we've crawled 90,000,000,000 pages (which is about 35% the amount in Google's index).</code>
Therefore, if the site is not linked to by one of these seed URLs (or one of the URLs linked to by them in the next update) then it won't show up in our index. Sorry!
We update our Mozscape Index every 4 weeks. Crawling the entire Internet to look for links takes 2-3 weeks, but our crawlers are always collecting data. When we need to put the index together, we grab all the data they have collected and start processing which can take up to 3 weeks to determine which of those links are the most important. You can see our most recently updated schedule here: http://moz.com/products/api/updates
Mozscape focuses on a breadth-first approach. Therefore we almost always have content from the homepage of websites, externally linked-to pages, and pages higher up in a site's information hierarchy. However, deep pages that are buried beneath many layers of navigation are sometimes missed and it may be several index updates before we catch all of these.
If our crawlers or data sources are blocked from reaching those URLs, they may not be included in our index (though links that point to those pages will still be available). Finally, the URLs seen by Mozscape must be linked-to by other documents on the web or our index will not include them.
For now, the best thing you can do to help your domain become indexed is to work on link building for links from sites with high mozrank.
Hope this helps clear things up!