You shouold look into RSS feeds and parsing those out into the data you need. Most WP installations will have the RSS available, SEE HERE.
There are many ways to do this, but I have found that grabbing the data already available is simple and writing out a controller to parse and display the data you seek is simple enough. This is just one way, may or may not work for your application but I have had great luck.
Good luck and hope this can steer you in a direction toward your solution.