What's with all the pictures of cats?

[dolorous_ett]

A quick glances through Friends pages on my F-list show that lots of people are fond of big pictures of cats in funny or cute postures with amusing slogans photoshopped onto them, like IM IN UR FRIG EATING UR FOODZ. By which I mean lots and lots of pictures of cats with slogans, not just the odd one every few days. It's starting to seem like an addiction, or possibly an infestation.

I'm a cat person and quite fond of looking at cats, given a chance. All the same, I'm starting to suspect that there is a joke here that I'm just not getting. 

Anyone care to enlighten me?