A Facebook search engine is in the works, and it demands everyone’s attention. For one thing, Facebook’s 1 billion searches a day would mean it would immediately be the No. 2 search engine behind the almighty Google. So when Facebook unveils its search engine, it will be important to understand how to rank well in its results. Here’s a look at 12 potential Facebook ranking factors. The list includes the pure number of likes for a piece of content or domain; engagement within a specific country, region or city; and on-post optimization. (Search Engine Journal)