I'm doing a project in which I need data about users in a professional social network. I need information related to the experience, education or skills of the users. So far I've tried LinkedIn but the API does not allow getting this kind of information and I've also tried Xing but I'm having several problems using the API since the information I retrieve is mostly about test users and not the real ones. I've also searched the web for a dataset with similar characteristics but I couldn't find anything.
Please if you could recommend me another social network with an API that allows developers to retrieve this information or even better if you know where can I find a data set with this or similar characteristics I would really appreciate it.