I am in a dilemma. I have used an old publicly available dataset for some of my analysis and want to publish it. But the problem is that it was publicly available and hosted in a website (infochimps.com) some 4 years ago. But now it's not available there and I got the data from a Github repository. It's not possible to reach the owner of the dataset as the email id given in the readme file is no longer valid. But recently there have been some analyses on the web which have used this data directly from the github repo.
So my question is can I use this data for my paper? And if yes, how to cite it?