My initial response here is negative. To my knowledge, Github has to this point had a fairly good reputation around selling personal data and makes their money elsewhere. This has a lot to do with their success versus the wide selection of competitors that have come and gone. As the purchase by Microsoft is almost certainly for integration with their Linkedin property, there's little question that this policy will change.
I don't think we need a Facebook for Developers.
The Slashdot story seems to agree, quoting the CEO:
Nadella wrote:The LinkedIn team has grown a fantastic business centered on connecting the world's professionals. Together we can accelerate the growth of LinkedIn, as well as Microsoft Office 365 and Dynamics as we seek to empower every person and organization on the planet.