The fight between dog & cat?

Hey,you must be wondering why the title is so dramatic,yes it is. A fight between my bestfriend A and bestfriend B,A & B is a BFF actually but because of something cheesy they fight. They fight by internet,insulting each other on the blog,this is so sad. They used to be BFF,but because of word,they fight. And what should I do to make them be friends like what they used to do. Please,anyone gimme some ideas :|