Another impression I have is about sharing memories, and that impression is both good and bad. I think the idea to share and comment instantly on other people's memories is really cool, however the concerns about getting your page spammed into oblivion seems to have come to fruition.
This is not a universal problem, as most people aren't doing this...however I've already deleted one person off my friends list because they felt that they had to post every last memory that popped up (not to mention a few custom memories) for no other reason than they had the ability to do so. I posted a comment about this, and her response was essentially: "It's new so I have to use it as much as I conceivably can," so I removed her. For the record: there is nothing new about this. It's Facebook for your sims. Facebook has been around for 7 years now so there's nothing left to figure out.
If you're using the social features, please do not do this. It's annoying beyond all reasonable limits to be playing your game and have live updates every 3 minutes that someone else's sim just went to the park, or the library, or burned their dinner.