Hillary Clinton has a very important announcement to make Sunday about something everyone already knew she was going to make an announcement about: she's running for president.

The news set off political Twitter, which mostly made jokes about how we knew this was coming and how so many details about her announcement are already out there. Here are some of the hottest takes about the big news.

On Clinton-mania:

An alternate headline for the news:

What her announcement means for Lincoln Chafee's burgeoning campaign:

The still unanswered questions about her announcement:

The less-discussed details about her big day:

The early Washington Post/Fix 2016 Democratic primary projection:

What that new chapter in the paperback edition of "Hard Choices" is really about:

And of course, what this means for political reporters this weekend: