The test I (very loosely) apply when deciding what to include or exclude is assessing whether it would be helpful to other THNers to know you're playing that game because it'd make their and your game better.
Spore is an edge case. It's helpful for people to know you play Spore even though you don't play together because then you can share content. In Fallout 3, it doesn't matter one way or another if others know you're playing because they can't do anything about it or benefit from that knowledge (in any technical way).
Spore is an edge case. It's helpful for people to know you play Spore even though you don't play together because then you can share content. In Fallout 3, it doesn't matter one way or another if others know you're playing because they can't do anything about it or benefit from that knowledge (in any technical way).