[asaph]

It's a way to personalize your account and a way for people to easily recognize an online identity across comments, articles and communities. It helps you discover that @asaph on HN is the same person as @asaph on GitHub, Twitter, Stack Overflow, etc.

[thrower123]

One of the features of HN is that identity is downplayed. Personally, I think that this encourages engaging with the arguments that someone makes, rather than who they are.

It's also a throwback to the old internet where pseudonymity was normal. It's refreshing to see usernames like AdmiralAsshat and TooMuchToDo.

[huntie]

Why does it matter if they're the same? Identity is vastly overrated in my opinion.

[java-man]

it's a way to track you.