There were a lot of attempts to achieve something like that in past. I am aware about such modifications for newsfeed:
https://www.google.com/...&channel=ipad_bm
I think that this idea was not implemented due to amount of server resources such functionlity might consume. A lot of Oxwall users are on shared hosting plans that are very strict. If your read through forum you will notice a lot of reports that users can't upload videos or photos because their servers are blocking Ajax requests ( mod_security) . Imagine having Ajax auto refresh if even ajax photo upload is getting blocked on server side