I don't feel as if I really have a right to answer the poll since I have yet to post anything here. I have just started posting a few minifics recently. I still wanted to answer the question. I think that if two people have a history of co-authoring fics or are writing one following the prompts it should be fine to post here. But for two people to decide to co-author simply to make it easier to post they should not. Unfortunately many people start off with good intentions but the majority of the work only gets done by one person. This only one persons opinion so take it with a grain of salt if needed.