Weather AADHAAR no. Should be shared or not is become a matter of concern, recently it was also linked with right of privacy as this no. contains biometric information of individual. So to tackle this problem UIDAI ( Unique Identification Authority of India ) introduced the concept of Virtual ID to further strengthen the security and privacy.
Once it's implemented VID can be used in place of AADHAAR no.
VIRTUAL ID can be generated from UIDAI official site.