XCOM: Enemy Unknown is a brutal lesson in life, love and the fragility of human flesh. Your squad members will die, dozens of them, while you are forced to watch in omniscient yet helpless real-time. Each game has its own graveyard, though if you want to share your losses with the world, there's an app for that.
The XCOM Memorial Wall on Facebook hosts all of the fallen soldiers added by mournful players. Add yours by simply clicking that big button on the top and filling out the appropriate assets. Turns out Facebook can be used for some pretty cool (and heart-wrenching) things, after all.