Oh, well that's a little confusing isn't it. They really should be linking to the first one, which is the most recent update. I'll be updating it soon since I'll be rolling out 0.3.0 in the next day or two.

Both posts were updates that happened in pretty rapid succession, I believe a day apart.

For your feature request - I've got it copied down, I think it's a good idea. Currently the "recent activity" section only shows posts by the people you're following and posts that you've voted on. But it would be nice to also be able to see their comments and maybe even votes of the people you're following as well. I'll give this some thought and see if I can't add some filters to help you accomplish this.