If you have Steam and you don't have TF2, I suggest you give it a try!
Team Fortress is a free to play FPS combined with humor, timing, and team cooperation. It has been out for ages and is still as good as new. It gets freshly updated every so often and is still widely played. TF2's fan base is one of the best and most active I have seen for being a relatively older game. I am so glad it's still alive and well. You can find more here. There are also other cute GEEKY Valentines cards too!