One strategy for Angry Birds Facebook Pig Tales level 21 is to send Matilda towards the base of the structure to clear the first column. Then use the Bomb Bird in the same direction to destabilize the main tower. Finally, send a third bird, if necessary, to collapse the entire structure. The score in the video below is 86,600.
Our Angry Birds Facebook walkthroughs show you how to obtain 3 stars, most of the time without the aid of Power-Ups (we do make exceptions). If you have a different strategy feel free to leave a comment below; however, don't just post your score via the comments, as that's what the Facebook leaderboard is for.