explain xkcd:User: Aprilfoolsupdate!

Wow what? I can create my user page now! Yay!
About me: basic knowledge of html, nothing else
My signature: ^April_fools^update!(talk)
I like my signature, don’t touch it.

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Leaderboard for top 50:

Aprilfoolsupdate!
Aprilfoolsupdate!
Born date	Not telling
Planet	Earth [citation needed]
Language	English
Stellar system	The solar system

Last 7 days (Top 50)

Rank Score Pages Changes Username 1 40 30 55 DollarStoreBa'al 2 24 18 26 TheusafBOT 3 18 7 36 Elizium23 4 10 4 14 John Hawkinson 5 9 5 10 Kynde 6 9 3 12 BunsenH 7 9 6 8 Utdtutyabthsc 8 6 4 5 GreatWyrmGold 9 6 3 5 管委会篝火无法解放军“赐额“你去呢管理哦法？ 10 5 2 5 Martin 11 5 3 4 August Fuller 12 5 1 5 R128 13 5 2 4 Daniel Griscom 14 4 1 4 Victor 15 4 2 3 boB 16 4 4 4 Lemondoge 17 4 2 3 DKMell 18 4 2 3 William 19 4 2 3 Jacob Thrall 20 4 1 3 RadiantRainwing 21 4 1 3 Qwertyuiopfromdefly 22 4 1 3 Drkaii 23 3 3 3 Potatocakethrow 24 3 1 2 Magtei 25 3 1 2 MikeTheNewGuy 26 3 1 2 StapleFreeBatteries 27 3 1 2 SqueakSquawk4 28 3 1 2 DukeLeto7 29 3 1 2 Dwray 30 3 1 2 Eeeee 31 3 1 2 Spinninnnn 32 2 2 2 Lyall Deere 33 2 2 2 Firestar233 34 2 2 2 Gregory 35 2 2 2 Orion205 36 2 2 2 Elektrizikekswerk 37 2 2 2 Lordpishky 38 2 2 2 Paul 39 1 1 1 Nathtan Roberebor 40 1 1 1 Keith Williams 41 1 1 1 Ken g6 42 1 1 1 IAmADroid 43 1 1 1 CalibansCreations 44 1 1 1 KarMann 45 1 1 1 J-beda 46 1 1 1 These Are Not The Comments You Are Looking For 47 1 1 1 NErDysprosium 48 1 1 1 Jon 49 1 1 1 Viliml 50 1 1 1 WingedCat