Even if Microsoft has become a bit more trustworthy with Nadella then it was with Ballmer it remains an interesting question how much we should trust them concerning our data. The same issue arouse with Skype and other acquisitions in the past. Deleting an account probably does not change much, because it might just delete the access point to the account, not actually the data.
And anyway the NSA could query LinkedIn just as well es Microsoft.
In any case it is interesting to know about this acqusition.
Find more links yourself, it won’t be hard.