There are many softwares in market to manage your Whatsapp privacy.But you can mange this by follow this simple steps.Here we go...
Step One- Open your Whatsapp Application and go to setting.
Step Two- Select Privacy...
Step Three-You will get three option.Like Last seen,Profile Photo,Status...
Step Four-Now Select who can see this...
Note-If you don't share your Last Seen,you won't be able to see other people's Last Seen.
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