I notice that the tab on the user profile page formerly known as "activity" is now called "activities".
This is kind of weird wording. It suggests that each entry visible when you're on that tab is "an activity". Posting a comment or accepting an answer is not really something that I conceptualize as "an activity", though those things are certainly part of "my activity on the site".
Perhaps we should call this tab "actions" instead, like the header says when you're on the "all" view of the tab:
(Yeah, this really isn't important at all, but I haven't gotten any good bikeshedding done lately, so...)