I started this thread because it might be helpful to have a discussion about posting memories.
Most of us old-timers regard memory notifications as an annoyance. We don't want to read about how our own Sims repaired the toilet, let alone the memories of all our friends.
However, people new to the Sims can get some fairly nice items as rewards for posting memories. It's not fair to expect them to forego these. Also, if there's some sort of automatic posting feature, it might take a while for someone to find it and turn it off.
It also seems to me that there are times when it's appropriate to post a memory -- weddings, births, the first time an immortal eats ambrosia, etc. On the other hand, it would be inappropriate to post from a challenge game as that could give other players hints as to your strategy.
I'm not sure what to recommend, other than that players who post memories for the rewards go to their walls afterward and delete them.