The first?

Travel to the ruins
imgflip.com/i/1m

It's fun to look back at them!

By the way, the first meme on imgflip is this one:
9.jpg (click to show) imgflip.com/i/9

Yes, I went further back and found that this was the first ever, but now I have an instant gateway to olden times
imgflip.com/?sort=latest&;page=27585
Just change the number to ascending order when more memes are made over time
Also holy f**k all those pages.

It's a lot of pages. :)