If one notices someone with more than one account in SU, how should it be addressed?

For example:

http://superuser.com/users/282532/rajesh-kumar

http://superuser.com/users/282310/rajesh-kumar

I am not sure the best way to bring it up but here on Meta. Is there a better or more preferred way to alert an admin?

If one notices someone with more than one account in SU, how should it be addressed?

For example:

https://superuser.com/users/282532/rajesh-kumar

https://superuser.com/users/282310/rajesh-kumar

I am not sure the best way to bring it up but here on Meta. Is there a better or more preferred way to alert an admin?