Most of your favorite celebs are still celebrating America's birthday today (July 5), but plenty of them still got down to business where it matters: Twitter. Because the truly famous never take a vacation from 140-character missives on everything from selfies to silly advice.

Nicki Minaj made a splash just with the simple announcement that she joined Instagram.

Miley Cyrus addressed Jay-Z's diss in an either oblivious or tongue-in-cheek (or in her case, perpetually sticking out) way:

Justin Bieber reminds us that he and Selena Gomez are back together with a cryptic tweet from the most recent night they were snapped cuddling:

Chris Colfer is proud of how much his fish has grown up:

Judah Friedlander knows the true meaning of patriotism:

Colin Quinn offers deliberately trite tips on how to beat the heat:

President Barack Obama is having more fun right now than you are: