I think you can if it is well written and the dialect is used not only for stylistic reasons but also for character development. A good example is...
Hi fellow newbie!! & why do people call you froggy?? haha thats so random!
I have no idea what to write in this thing so i'll just go with the basics: Hello I'm Mollie and I'm new. It's a little short and dull but I...
Separate names with a comma.