Damn, six years ago.

Note: today is 2018-11-06
 
Here is the list of all the pair tags of the image (plus applespike, which was missing).  
rarilight, twidash, twishy, twijack, twinkie, twispike, raridash, flarity, rarijack, raripie, sparity, flutterdash, appledash, pinkiedash, rainbowspike, appleshy, flutterpie, flutterspike, applepie, applespike, pinkiespike
 

 
Here is that list, ordered by tag count:
 

 
After this link is a script which orders any tag list of the page by tag count: gist/loxaxs/derpibooru-sort-tag-by-count.js.
 
You can use it by copy pasting it in the console tab of the developer tools that you can open with F12 or Ctrl+Shift+I or Cmd+Shift+J.

@Party Pie Grenade
 
Considering this was posted four years ago, yeah, I’d say it’s just a little old.

wow, this is really outdated…

I would have gone with pinkity

Applespike was missed. AtM, it has 184, and only about 10 have been posted since this image, making it the third most common Spike ship.

Applespike is considerable.

@Background Pony  
Boy what

@Background Pony  
Proper grammer please

Rarity really wants love I know rarity hugs her… I really love Rarity but I hate all the other Rarity, Applejack, Rainbowdash, Flittershy, Twilight shippings. But love Raridash they may be boring but I See white and blue like a good thing. I want raridash too be popular. If rarity died would Rainbow dash cry? Or would she be ashamed? ( Rainbowdash: it is all my fault :()

No dammit we need more Raridash I mean Rarity is so beautiful and I know Rainbow dash hasn’t hang out with her that much I mean come on guys.. Who is with me? I’m a Raridash fan and A Flutterdash hater sorry… Please I want raridash please… I’m begging

I can honestly say I’ve never seen any fics or art of Flutterspike, Pinkiespike, or Rainbowspike. Not to say those pairings are bad or uncommon, I just see a lot more Rarispike (closest thing to canon we have at this point) and Twispike (not sure if incest or not)

QUICK MAKE MORE FLUTTERDASH WE CAN BEAT APPLEDASH I KNOW IT

@Advance
 
No it doesn’t. You’re basically saying that all ponies of the same size have the exact same age, that a 1 age gap makes the difference in size between Fluttershy and Pinkie and that ponies supposedly grow in size like Fluttershy did.
 
My “headcanon” is that Fluttershy’s look in that episode was there to explain her clumsiness (she found it kinda hard to fly and stumbled over her own legs, as if she wasn’t accustomed to her own body) as some growth spurt.

@Background Pony  
Because she’s bigger than Pinkie in the flashback, and Pinkie was the same size as Rarity, Rainbow Dash, Applejack and Twilight.  
It makes a lot more sense than whatever headcanon you have.

@Advance
 
Nod to what? To that one time she said she was a year older than Pinkie? How does it go from being older than 1 person to being the oldest? There is barely a connection. And don’t say it’s practically confirmed because it isn’t at all,

@Background Pony  
To me it looked like the writers were purposefully making her larger to indicate her age as a continuity nod. Seriously, man, it’s practically confirmed.

@Advance
 
So is Snails, but nobody’s saying he’s the oldest of his generation. Also, this would mean that barring these two we’ve never seen a pony who is between a child and an adult’s age.
 
Honestly, it looked more like she was ganglier to justify her clumsiness.

@Background Pony  
She’s larger than all the other fillies in the flashback.

Honestly twijack needs to be more popular

You forgot ‘Applespike’, but its good to see Spike get so much love.

@Advance
 
It’s only canon that she’s a year older than Pinkie.

@Background Pony  
me to i think twipie sounds way better

@FlutterLove  
That’s one of the worst headcannons I’ve ever heard. It’s proved in the Cutie Mark Chronicles that all of the mane 6 are the same age, except for Fluttershy, who is a year older.

I hate how Twipie is called Twinkie on this site