Pressing one key (two if you count going back to the top) is exactly the kind of effort that most people don't make. :-D

The problem with that little notice is that if you have a lot of email in your inbox, you have to make an effort to scroll down to see it.

Most people don't make efforts.

Maybe if the last activity notice were in the sidebar or near the top of the screen it might be more effective.

I also love how the lead-in to the story discusses a woman who apparently became jealous because her "married boyfriend" was cheating on her...

Actually, it's more like "nucular", "gubmint", and "librul".