Most of the meme content in France is in English, but some people decided to make some french memes too.
They mostly come from jeuxvideo.com, which is a forum for young people that honestly can be compared to a cleaner 4chan.
For instance, they're the ones who trolled Shia Laboeuf and it's "He will not divide us" campaign
There isn't much content of memes in france, but the most known ones coming from here would be El Risitas and some unflattering pictures of a politician called Henry de Lesquen (here are some memes)
Finally, as some French man who comes from all of those weird, random places of the Internet, in my opinion, I would say that when it comes to memes, French people are ... Different than the rest of the world.
We don't really create memes that are caption over pictures. We rather make very dumb twitter posts with generally crude language or insults/comparisons in it, to mock some situation or person.
If you want to grasp the concept of french memes, I highly advise you to lurk jeuxvideo.com, and the most known "memers" such as Valek (comes from JV.com).