I used to work for a large investment bank and we would get random calls from people claiming to be from HR. They will ask for specific information that is obvi

I used to work for a large investment bank and we would get random calls from people claiming to be from HR. They will ask for specific information that is obviously confidential. If someone claims to known someone but asks you for their contact info, you should be suspicious. My response to these ppl: why dont u look him/her up on fb/linkedin.