Prompted by a question from Yusuf, I have been exploring again how to set up OAuth authentication on your OLab server.
I am pleased to say that the process still works just fine for Facebook and Twitter logins, with only tiny changes in the steps needed, which are self-evident.
It is not so easy for Google+ logins. There are more steps needed now, and I seem to have run into a wee loop of steps where I can go no further. Happy to discuss this further with other groups who are trying to do this.