These days, everyone who's anyone is partying over in the Twitterverse (bonus -- you don't even have to leave your couch!), and celebs are no exception. Also, if you don't know what Twitter is, a.) Seriously?!, and b.) Watch this.

Anyway, we here at Buzzworthy love Twitter because, well, we Tweet! But also, we love Twitter because the sheer entertainment value of following your favorite celeb CANNOT be overlooked. We've laughed, we've cried, we've poked our eyes out (after reading John Mayer's penis-falling-asleep Tweet) and attempted to set our keyboards on fire (ENERGY!). But we always come back for more.

So, herewith is our roundup of our favorite, must-follow celebrities who Twitter.

CLASS A CRAZIES: This group includes the "must-follows" -- the celebrities whose Tweets are so friggin' BANOODLES you simply cannot miss them.
+ Diddy (@iamdiddy) -- If you follow NO ONE else on this list, please, please, please follow Diddy. (LET'S GO, PEOPLE!)
+ MC Hammer (@MCHammer) -- Apparently he was hiding an early adopter in those glittery Hammer pants!
+ Shaqille O'Neill (@THE_REAL_SHAQ) -- Shaq lives in Twitteronia.
+ Snoop Dogg (@snoopdogg) -- His "izzle" talk just slays me every time. Occassionally Tweets while toking.
+ Steve Buscemi (@steve_buscemi) -- He hates penguins!
+ Solange Knowles (@solangeknowles) -- Love Solange, but when is she NOT Twittering. I think she's the sole reason Twitter keeps crashing.
+ Xzibit (@mrxtothaz)
+ Ryan Seacrest (@RyanSeacrest) -- Dude Tweets DURING COMMERCIAL BREAKS of American Idol! HOW IS THAT EVEN ALLOWED?
+ Lily Allen (@lilyroseallen) -- Lily still kinda hates Perez Hilton, and they are FOREVER back-and-forthing forever on Twitter.
+ Heidi Montag (@montagheidi) -- I swear to the Lord, you will S--T when you see how many of Heidi's Tweets are about Jesus!
+ Spencer Pratt (@prattspencer) -- Sometimes he's on the Bible train too, and he once even compared himself to Jesus. Epic.

FAMOUS BUT KINDA BORING: This group is dependable though almost never shocking. But they're all famous, so they've usually got somewhat interesting things to say. Just don't expect ALL CAPS Diddy rants or Lily Allen vs. Perez Hilton feuds):
+ Britney Spears (@britneyspears) -- Sometimes Britney's team posts for her, but this is still a good one.
+ Selena Gomez (@selenagomez) -- Yay, Selena!
+ Demi Lovato (@ddlovato) -- Demi and Selena leave each other little Twitter notes. 'Scute!
+ Taylor Swift (@taylorswift13) -- W00t Taylor! Predictably, Taylor Swift's Tweets are sweet.
+ Dave Matthews (@davejmatthews)
+ Soulja Boy Tell 'Em (@souljaboytellem) -- Mostly Soulja wants you to click on shiz for him and make him more famous. Soulja Boy also Tweets his beef with 50 Cent. (That was one of the weirdest sentences I've ever typed.)
+ Dave Navarro (@davenavarro6767) -- Tweets about being bored and playing video games. Fair enough, we say!
+ John Mayer (@johncmayer) -- He's become a bit of a mad Twitterer lately, and I'm actually a little tempted to move him to the above category. He once Tweeted about his penis falling asleep.
+ Sara Bareilles (@SaraBareilles) -- Sara Bareilles really needs to Twitter more.
+ Mark Hoppus (@markhoppus) -- He's been Tweeting about blink's new album a lot.
+ A Cursive Memory (@acursivememory) -- They really need to Tweet more.
+ Simon Curtis (@simoncurtis) -- Yay! We LOVE Simon Curtis! Posts fun pix of his trips.
+ Regina Spektor (@reginaspektor)
+ Liam Gallagher (@liamgallagher) -- Surprisingly, this feed is not so crazy. Bummer.
+ LeAnn Rimes (@leannrimes)
+ DJ AM (@DJ_AM)
+ REM (@remhq)
+ Duran Duran (@duranduran) -- Yes, they ARE still around!
+ Nick Cannon (@nickcannon4real) -- Mr. Mariah Carey is livin' large in the Twitterverse too.
+ William Beckett (@billbeckett)
+ Bjork (@bjork) -- Hers are crappy, unfortunately.
+ Four Year Strong (@fys)
+ Janelle Monae (@janellemonae)
+ Katy Perry (@katyperry) -- More exciting IRL than on Twitter. Oh wells.
+ Lady Gaga (@ladygaga) -- Ditto. Lady Gaga's Twitter sorta reeks of label Tweeting.
+ Ingrid Michaelson (@ingridmusic) -- Hers are cool and make me wanna hang out with her even more than I already do.
+ Cinema Bizarre (@cinemabizarre) -- Lady Gaga's German tourmates are also Twittering!

More celebrities on Twitter after the jump!

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(Credit: Andreea Radulescu)

We've finally found the only thing more hardcore than "heavy-punk-pop" band Four Year Strong's music: their ability to walk onto a grueling photo shoot after a full day's work and still manage to take pictures so fierce they would make Tyra Banks proud. What's their secret? We're not sure, although we're thinking it may have something to do with all five members sporting the patented Teen Wolf look. Meanwhile, we're just thrown by the balls-to-the-walls intensity of some of these shots. (If we'd known they had this kind of pent-up aggression, we never would have sat so close to them during our recent video interview!)

Anyhow, check out these exclusive MTV photos of Four Year Strong and revel in the band's ability to go from happy-go-lucky to serial-killer-insane in the span of a single frame.

[Photo Credit: Kyle Holmquist]

With emo pioneers The Get Up Kids and hardcore heavyweights Blood For Blood as their influences, it'd be impossible for Four Year Strong to not have an ineffable, hybridized sound.

But whatever you want to call their music (they say "heavier pop-punk" to make it easier for the label-obsessed), the five-piece band's debut disc Rise or Die Trying incorporates the heavier aspects of their hardcore roots, while embracing upbeat tempos and soaring, sing-along choruses that puts them in line with like-minded peers New Found Glory and I Am The Avalanche.

In this exclusive interview, the band sheds light on what their band name means, leaking their own music, and what they're up to next.