Suppose that the species in question is not at any ecological competitive disadvantage--they live in an environment (e.g., the deep ocean floor, caves) where very few, if any, creatures can see.
They can communicate through touch (see, e.g., Protactile ASL), and write with something like Braille. Nevertheless, there would seem to be some issues with socialization if you can't tell who you are talking to, or that someone wants to talk to you, until they have already touched you; or if you can't find someone to talk to without stumbling into them--or can you? After all, deaf-blind humans somehow manage....
So, what kind of conventions might arise for social organization in such a species, and could they go so far as to develop civilization? The only physical characteristics of individuals that are set in stone are that they are completely blind and cannot create sounds useful for communication; if answers depend on any other particular physical morphology, feel free to assume whatever physical form is most convenient.