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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With Warped Tour over, A Cursive Memory is stepping down from their Buzzworthy guest blogging post, at least for now.

Check out their fourth and final video diary, in which they fight back the inevitable tears that come with saying goodbye and instead leaving you the faithful ACM fan, with a challenge and a clip of Dillan taking his last name literally.

+ Plus: ACM Rewind: Tour Diary Part 1 | Part 2 | Part 3

... And boy are our hands tired. We have our suspicions, but we, like you, won't know fo sho until this Friday night on FNMTV, when the final nominees in the "Best New Artist" category are announced, along with the "Best Dancing In a Video" noms. Seriously, someone's mom's gonna be super proud when she finds out she's one step closer to getting a Moonman to proudly display on her fridge.

Anyheezy, out of the eight pages (!!?!?!?) of possible VMA Best New Artist nominees, here are 10 of our favorite picks and their A+ videos.

+ OneRepublic, "Stop and Stare" -- Their smash hit "Apologize" is also a contender, but "Stop and Stare" hurts even better.

+ Leona Lewis, "Bleeding Love" -- Buckets of sexy, soulful emotion!

+ A Cursive Memory, "Everything" -- Punk'd 2.0!

+ Tokio Hotel, "Ready, Set, Go!" -- Duh...

+ Taylor Swift, "Teardrops on My Guitar" -- Seriously, how could Drew make our little pretty pretty princess cry!?!?

+ Vampire Weekend, "Oxford Comma" -- Wes Anderson + grammar = nerds unite!

+ Kid Sister, "Pro Nails" -- Inspiring us to keep our tips fly!

+ Estelle, "American Boy" -- Inspiring us to up our frequent flyer miles. And ring Kanye about another breezy duet.

+ She & Him, "Why Do You Let Me Stay Here?" -- Oh, Zooey. Why do you have to be so cute?

+ The Teenagers, "Love No" -- Frothy drinks, rollerskates, sexual tension and lotsa tongue? Yes, please!

More VMAs here.

Part 3 of the A Cursive Memory tour diary finds the guys plugging their band name (and MTV.com!) in front of a seemingly malodorous restroom. And while there's no talk of sharks -- or lame-o Supersmash Brothers characters -- this time around, there is a crazy (and likely illegal) fireworks display! Though we're guessing you'll probably remember this tour diary most for its inadvertently awkward timing and apparent lack of a courtesy flush.

So sit back and watch as the happy-but-overtired foursome complete their leg on Warped Tour -- and go out with a bang -- then catch up A Cursive Memory's first and second tour diaries without ever leaving your seat.

A Cursive Memory's Colin and Mark venture into bucolic unchartered territories -- or, Canada, as it's known to the 33.3 million people who live there -- show you a clip from their Detroit show, where their bodyguard did the booty shake on stage, and invite you to discuss sharks with them if you're at their next Warped Tour shows in the New York area.

Watch their latest tour diary below, and check out Part 1 here.

A Cursive Memory has nothing but love for you, the city of Chicago, Warped Tour, and Super Smash Bros., but absolutely no one chooses Pikachu except for Dylan.

Watch their first of what we wish were hourly tour diaries from A Cursive Memory, the band that invented Bandarazzi. And check out our exclusive interview with ACM, who answered all of our questions about shooting "Everything."

L.A. pop-punk band A Cursive Memory spent half a year working on the video for their low-fi emo single, "Everything," but they didn't spend weeks casting the perfect pony-tailed pretty girl to play the starring role. There would be no unknown pony-tailed chick, and, with the exception of themselves and a seriously old-school ghetto blaster (immortalized on the cover of a Run-D.M.C. album in a previous life), they didn’t do any casting at all. But they did manage to wrangle scores of random celebrity cameos -- Paris Hilton, Steve-O, will.i.am, Kevin Connolly (famously documented on TMZ, who referred to him a d-bag), Britney Spears, Perez Hilton, Jerry Springer -- and get socked in the face by Diddy’s bodyguard, who called the cops on them after Diddy gave them his best "oh HELLLLLLLIS no" face.

Naturally, we needed to know more. So we brought A Cursive Memory to MTV and turned the camera on them to get more dirt on "Bandarazzi," see who didn’t make the cut, and find out what was too hot for their inevitably viral video.

Their adorablay-ness and catchy spell-along anthem would've been more than enough to appease us (because we're admittedly easy), but power-pop foursome A Cursive Memory (love that they have "emo" built right into their name) "leveraged" their L.A. locay to ambush handfuls of celebs to unintentionally appear in their "Everything" video -- including a visibly displeased Perez Hilton who hurled some "we are not amused"-isms at the boys, which ended up on the cutting-room floor. (Guess he's getting into Simon Cowell mode for what may be a six-figure A&R deal with Warner Music.) At least Perez is fully aware that no one wants to see him shirtless. More cooperative: Paris Hilton.

See how many ambushed A-listers you can spot (we're too lazy to count how many, but there are lots), courtesy of A Cursive Memory's ballsiness -- sorta like Adnan Ghalib, minus the pills, the extreme shadiness, and all that gratuitous Ed Hardy.