This is by no means exhaustive, because if I wasn't around on Twitter at the time or wasn't interested, it would have slipped past me. At this point, I would just say go browse Social Nerd Art's archive or SDCC tag, or The Mary Sue's tag, if there's something you're interested in.
FIRST OF ALL:
@VanityFair: Catching Fire at Comic-Con: Jennifer Lawrence’s Nine Most Charming Moments
Little details included in the Catching Fire adaptation.
@LennyKravitz: At #comiccon for #hungergames with#jenniferlawrence and joshhutcherson instagram.com/p/cAPTOHPD7Z/
@cinemablend: The Hunger Games And I, Frankenstein 2013 Comic-Con Live Blog
@io9: I, Frankenstein looks like next year's Hansel and Gretel. Get excited.
There was a reunion panel! Most notably, we learn that Gillian Anderson does not age.
@MattMitovich: THE X-FILES @ Comic-Con: Gillian Anderson, David Duchovny Revisit TV Romance, Express Interest in New Movie
Assorted things I saw go past at some point:
@cinemablend: True Blood 2013 Comic-Con Panel Live Blog
@EW: Comic-Con 2013 'Agents of SHIELD' at Comic-Con: Clark Gregg on Agent Coulson's revival
@EW: Comic-Con 2013: Eye on Day 1 Panels: ''Dexter,'' ''Beauty and the Beast,'' ''Hannibal,'' ''The X-Files'' & more!
Speaking of which, the two previous linkspams were about the joyously crazypants Hannibal pannibal and Nerd HQ fan Q&A, respectively.
The Amazing Spider-Man 2:
@cinemablend: Watch Andrew Garfield Do A Comic-Con Panel In Character As Spider-Man
@EW: 'Amazing Spider-Man 2' at Comic-Con: Sequel shows 'most exciting chapter in Peter Parker's life'
Man of Steel 2:
WELL IT'S A FUCKING SUPERBAT LOGO, EVERYBODY GIVE A FUCK.
@TheNerdyBird: That happened. RT @TheMarySue: UPDATED: Zack Snyder officially announces Batman's involvement in Man of Steel 2.
@sepinwall: Warner Bros. making Superman/Batman movie because of course they are.
@mattsinger: BREAKING: Thousands flee Metropolis as Zack Snyder announces new Superman movie.
@MarkHarrisNYC: Early leak of the Superman/Batman script:
Superman: "Let's go get the bad guys."
Batman: "I can't fly. Carry me like a baby in your arms."
@io9: Time for an edge-of-your-seat scary glimpse of Cuarón's Gravity
@HuffPostEnt:"Gravity" was so planned out by Alfonso Cuaron that he created an animated version.
How to Train Your Dragon 2:
@TheMarySue: Kit Harington, Cate Blanchett Join The Cast Of How To Train Your Dragon 2
Teaser trailer: "son of a bitch we just got neville longbottomed by a goddamn cartoon"
@sepinwall: "Doctor Who" Comic-Con liveblog is now complete
@bleedingcool: Liveblog – The Doctor Who Panel At San Diego Comic-Con
20th Century Fox Panel: Planet of the Apes, Wolverine & X-Men:
@comingsoonnet: Comic-Con: 20th Century Fox Panel Live Blog
@ropeofsilicon: Caesar Approaches in First Official Picture from 'Dawn of the Planet of the Apes'
@RealHughJackman: I hope all of these people like The Wolverine. Here we go. #wolverine pic.twitter.com/o6bwa4xXdT
@screenrant: Footage featured an F-Bomb and Wolverine pulling a sword out of chest. And about a hundred ninja warriors.
@screenrant: "I don't want to be responsible for taking down Iron Man," says Hugh Jackman. He really loves the idea of Avengers crossovers.
Video: the Wolverine panel, "aka where we find out that Hugh Jackman can dress up as himself and wander SDCC and survive (and have at least one fan critique the quality of his copy of … himself)."
@girlsreadcomics: Jackman walked around SDCC in full Wolverine costume this morning. Only two people stopped him.
@ElisabethRappe: Hugh Jackman cosplaying as Wolverine is adorable. His receiving nothing but criticism doesn't surprise me at all.
@comingsoonnet: The X-Men: Days of Future Past panel starts!
@cinemablend: See The Entire Cast Of X-Men: Days Of Future Past Onstage At Comic-Con
@io9: First X-Men: Days of Future Past footage gave us goosebumps
@EricVespe: Patrick Stewart and Ian McKellen are getting the biggest cheers of the Con so far. Yay for geeks.
@screenrant: Each cast member is getting one quick question. McAvoy is wearing X-Men t-shirt with Nightcrawler on it.
@screenrant: Bryan Singer says no Deadpool in X-Men: Days of Future Past but anything's possible in the future.
Marvel - Guardians of the Galaxy:
I have no idea what any of this is about, except that I have heard something about a raccoon, but it seems like it's going to be A Thing, so.
@cinemablend: Watch The Guardians Of The Galaxy Comic-Con Panel, Complete With Karen Gillan's Bald Head
@adambvary: Karen Gillan reveals she shaved off all her hair to play Nebula, and throws her wig into the crowd.
(As seen here.)
@HitFixDaniel: I'm not sure I've understood a word on my twitter feed other than "Karen Gillan bald" for an hour.
@screenrant: "He's a very complicated Kree. He's a beast." - Lee Pace as Ronan the Accuser. Teases that they're going to show his image.
@screenrant: "I've been blue once, why not try green." - Zoe Saldana on Gamora in Guardians of the Galaxy
I don't think we know yet who's playing the raccoon, though. Maybe Vin Diesel.
AND THEN, THIS HAPPENED.
@screenrant: Fans chanting "Loki, Loki, Loki!"
@screenrant: Tom Hiddleston as Loki: "Where are your Avengers now?"
@mikeryan: Here's Tom Hiddleston dressed as Loki on stage at hall h. pic.twitter.com/GAToPoUmDn
@AgentM: "Claim loyalty to me. And I will give you what you need." - @twhiddleston
@EGeekly: Loki has a new army of 6500+ #HallH pic.twitter.com/ENXx20v67k
Watch Tom Hiddleston As Loki Ruling Over The Comic-Con Crowd: "Seriously, it's kind of wild watching in this video the kind of hold he has over the audience. Apparently he was also instructing the audience to "say my name," and they complied-- proving that if Loki ever did arrive from Asgard to take over Earth, and he was as charming as Tom Hiddleston, we'd all be totally screwed."
Personally, my favorite part is when he puts his finger to his lips in a hall of 6500 people and gets instant silence. That, and "MY WIFE LOVES YOU!!!!"
(2:22, multiple angles)
(4:15, side angle)
umbrafishies said: One youtube comment for this says “STANDING OVULATION". You’re welcome.
I haven't seen what happened at the Nerd HQ meetup today, except that it seems that raptor impressions were involved. (Wait, breaking news, here's the video.)
@io9: Watch Comic-Con's Marvel Cinematic Universe panel in all its glory. "Are you interested in Thor: The Dark World, Captain America: The Winter Soldier, Guardians of the Galaxy, Avengers 2: Age of Ultron, Tom Hiddleston in character and costume as Loki, Karen Gillan removing her wig, or any of the other insanity that happened at last night's Marvel movie panel? Then you probably want to actually watch it. "
@io9: Marvel movie panel nearly destroyed us with glorious madness.
@cinemablend: Eric & Sean Break Down The Thor, Captain America, And Guardians Of The Galaxy Comic-Con Footage
@comingsoonnet: Comic-Con: Thor: The Dark World & Captain America: The Winter Soldier Panel Live Blog
Oh, one more thing:
@screenrant: Fans lost it when Ultron's face was shown. The Avengers: Age of Ultron is the title of The Avengers 2.
@devincf: AVENGERS: AGE OF ULTRON. 2015. I literally yelled out loud when they showed Ultron's head.
@io9: Joss Whedon: No, You Don't Need Hank Pym to Have Ultron
@empiremagazine: Also had a chat with Kevin Feige about Avengers: Age Of Ultron. The title is 'borrowed' from the comic, but bears no relation to that arc.
I have no idea what any of this means, so... cool.
@ChitauriSteve: I have an audition for the role of Ultron. Wish me luck.
Fee free to chip in with anything you've seen around; that's about all the link wrangling I can manage for one day.