@Dirty Bit  
No wait better idea  
Pony: “Thanks for letting us host our event here Miss Twilight.”  
Twilight: “No problem it’s good to see ponies getting into books. What were you calling the event?”  
Pony: “BRPSOI! Or the “Book Reading Ponies Sufferers Of IBS.”  
Twilight: “Hmm?” looks in a medical book. “Ibs short for Irritable boOOOOOOOOOOOH MY CELESTIA SPIKE WE’RE BURNING THE PLACE TO THE GROUND!”

@ABronyAccount  
Cobras have fangs.

BRRRAAAAPPPPP!!!!!!!

@JP  
@PonyPon  
“Hey, you guys wanna go fart on Twiggy’s books? I bet it’d super piss her off!”

Poor Twi-Twi
 
@Otterhand  

 
I laughed

@JP
 
@JP  

 
I’ve actually been brain storming a fan fic along those lines.
 
It basically boils down to a background pony among background ponies. One who is so unremarkable, so plain that they others easily forget and over look them.

@Fwelin  

 
This is something I’ve wondered since the early days. How old was the tree? Who lived there before Twilight? What kinds of lives did the previous librarians have? What happened to the last one, and for how long was the library vacant before Twilight? Did any of them ever come back, only to find the tree gone?

@Fwelin  
That, or maybe the joke is no one in Ponyville cares about books but Twilight.

@JP  
I don’t think Ponyville ever had a public library. It’s more likely that the Golden Oaks was a government-owned library only for the government’s use, not for the public. As such, when Twilight moved in, they were her books for personal use. Consider:
 
1: We don’t see any signs of Twilight replacing anyone when she moves in.
 
2: Not once do we EVER see anyone borrkw a book other than Twilight’s close friends, meaning she could just be personally lending them her own books.
 
3: Similarly, we never see anyone but her friends enter the library (outside of the party in episode 1 and the weather team meeting hosted by her friend), and even they often knock, something you don’t do for public buildings.
 
4: Twilight is often away from the first floor on her personal time during the day (reading on her balcony, doing experiments in the basement, or just roaming Ponyville) with no replacement, nor do we ever see her doing public library work, so she doesn’t seem to have any library-based duties.
 
5: Twilight sometimes monopolizes the main floor for non-library things (such as Twilight Time or her research on the S4 box), which would hinder any book borrowing.
 
5: There was no replacememt public library after it was destroyed.
 
6: Apparently it wasn’t even super widely known that Twilight lived there, given Diamond Tiara’s surprise at a princess living there.
 
7: Twilight has never been mentioned to work at a library or as a librarian, only that she lives in one, nor was the library ever specifically mentioned to be a public library.

@JP  
Or guarded.
 
And has an awful lots of books…

And now Ponyville doesn’t have a public library anymore.
 
Though, her castle doors aren’t locked…

@BigBuggyBastage  
Those would match her night shirt!

“And…you never thought to use plastic furniture covers, or get vinyl cushions?”

Random pony: “OH BOY I love eating a giant pot of extra bean chili while reading war and peace!”  
Twilight: “BY CELESTIA PLEASE NO!”

Not to mention the homeless ponies looking for a quiet place to sleep and the folks who only come for the free wi-fi.

Vipers have fangs, though. So more like spitting cobras?