This is where I'm moving the huge list of pony fangroups that was on the main page, because this way I can dedicate more space to it. If you know of or run fangroups for ponies that aren't listed, feel free to reply to this thread with them and I'll add them. The same goes for alternate groups for the same pony (especially if one of the two groups is dead.)

This applies for any character, too, so fangroups for griffins, changelings, dragons, etc, are fine...

I'm starting out with a copy of the list as it stood, but I'll be adding to it.

The Main Six:
Applejack - Applejack, Applejack
Pinkie Pie - Ponka Po / Pinkie Pie: Pimkamena Diane Pie (Dead)
Rainbow Dash - Rainbow Dash, Rainbow Dash is Best Pony
Fluttershy - Fluttershy
Rarity - Rarity
Twilight Sparkle - Twilight Sparkle, Twilight is Best Pony, Free Twilight Sparkle!

Spike - Spike Fanfictions, Spike Fans
Sunset Shimmer - Sunset Shimmer, Sunset Shimmer is Best Pony
Starlight Glimmer - Starlight Glimmer, Starlight Glimmer I, Reformed Starlight Glimmer, Starlight Glimmer Deserves Lots and Lots of Love

The CMC:
As a group - Cutie Mark Crusaders / CMC Clubhouse
Apple Bloom (who really needs some love) - Apple Bloom
Babs Seed - Babs Seed / The Babs Seed Fan Club
Scootaloo - Scootaloo
Sweetie Belle - Sweetie Belle

The Dazzlings:
As a group - Adagio Dazzle, Sonata Dusk, and Aria Blaze are Amazing, The Dazzlings
Adagio Dazzle - Adagio Dazzle
Sonata Dusk - Sonata Dusk
Aria Blaze - Aria Blaze

The Our Town Four?: (Looking for a good name for this group...)
Double Diamond - Diamond Diamond
Night Glider - Night Glider
Party Favor - Party Favor
Sugar Belle - Sugar Belle

Twilight's Old Canterlot Friends:
Lemon Hearts - Lemon Hearts
Minuette/Colgate - Minuette, Do You Even Brush? (Fans of Colgate)
Moondancer - Moondancer
Twinkleshine - Twinkleshine

Adults:
Berry Punch - Berry Punch: Tipsy Turvey
Blossomforth - Blossomforth Is Best Pony
Carrot Top/Golden Harvest - Who Doesn't Like Carrots?
Cheerilee - Cheerilee Is Best Pony
Cloud Kicker - The Cloud Kicker Fan Club and Winningverse Group
Coco Pommel - Coco Pommel
Coloratura - Coloratura, Countess Coloraatura 'Rara'
Davenport - Quills & Sofas
Derpy Hooves - Project Derpy Hooves / The Derpy Army
Ditzy Doo - Ditzy Doo.
Fancypants - Fancypants
Fleur de Lis - Fleur de Lis
Flitter/Cloudchaser - Flitter and Cloudchaser Fans
Gilda - Gilda
Miss Harshwhinny - Miss Harshwhinny Is Best Pony
Mr. Breezy - Mr. Breezy Fans
Quibble Pants - Quibble Pants
Raindrops - Raindrops Needs More Love
Roseluck - Roseluck Fans
Silverspeed - Silverspeed
Spitfire - Spitfire is Best Pony
Stormy Flare (Spitfire's Mother) - Stormy Flare
Sunburst - Sunburst
Zecora - Zecora Fans

Colts & Fillies:
Button Mash = Button Mash
Diamond Tiara - The Diamond Cutters
Lily Longsocks - Lily Longgsocks
Pipsqueak - Pipsqueak
Rumble - Rumble
Noi - Noi
Silver Spoon - Silver Spoon
Silver Spoon & Diamond Tiara - Hug Silver Spoon and Diamond Tiara!
Snips & Snails - Snip & Snails & Puppy Dog Tales: Stories of the little boys of Equestria
Sunburst
Twist - Twist!
Zippoorwhill - Zippoorwhill

OC's
Snowdrop - Snowdrop Fanclub

Love for Ponies in General:
All Ponies - Everypony is the Best Pony
Background Ponies - The Sympathy for Background Ponies Society

Support Groups For Individual Ponies:
Protect Celestia -This is a group dedicated to preservation and appreciation of Princess Celestia.
The Defenders of Luna - As above, but for Luna.
Twilight Sparkle Protection Agency - "Dedicated to loving and tolerating our favorite adorkable bookworm."

--arcum42
Note: I'm removing all the asterisks indicating that a group is run by an admin of this group because, well, that's mostly no longer relevant, and was reflecting an admin staff that's mostly gone anyways.

5438902
As Admin and Founder of Protect Celestia of FiMFiction I approve of this list

5438909
Thanks. Now that I've copied in the ponies that were on the front page, I'm going through and adding more.

This does have a bonus of promoting all of these groups, of course.

--arcum42

5438922
Of course

5438902
You seem to have your work cut out for you. Here's a few more I'm aware of:

Minuette
Double Diamond
Party Favor
Sugar Belle
Night Glider
Lemon Hearts
Twinkleshine
Coloratura
Stormy Flare
Silverspeed
Sunshine Smiles
Moonlight Raven
Cherry Berry

5438937
Yeah, I doubt I'll ever get all of them, but I wanted to get the list more up to date, and the front page would have gone on forever if I didn't move it.

It shows a little how dated the main list is. It does have Minuette in the list... as Colgate, and doesn't have the Minuette group. I'll fix that. Admittedly, I'm in a few of the groups you listed myself. In fact, I'm an admin in the Cherry Berry group.

I wonder if there's a good name for Double Diamond, Party Favor, Sugar Belle, and Night Glider as a group?

--arcum42

5438902
Lily Longsocks!

Button Mash (There are groups for his non-canon family, too...)
Sunburst
Zippoorwhill
Quibble Pants
Noi

Snowdrops, maybe?

--Sweetie Belle

5438945

I wonder if there's a good name for Double Diamond, Party Favor, Sugar Belle, and Night Glider as a group?

Here's a thread with a few suggestions...

My personal favorite collective name for them is Luminary's suggestion: The Fantastic Four.

5438977
You know, I like that, but I'm not sure anyone would know what I was talking about, since the name doesn't really link to them in any way. Thanks for the link. I thought I remembered seeing it somewhere, but couldn't remember which one of the groups it was in.

5438971
Looks good. Maybe I should do a section for OC's that have ended up with groups...

--arcum42