WhoKnows provides multiple methods to control who can join your network.
Control network invitations
First you can control who your users can invite to the network.
Allow users to invite anyone - Checking this setting will allow any user to invite anybody they want regardless of where they work.
Allow users to invite fellow colleagues - Checking this setting will allow any user to invite only colleagues that work in your organization. This is controlled by only allowing invites to be sent to invitees with the same email domain as the network.
We can also restrict access through a white list of users who can join. Simply add the list of whitelisted users and only those people can join. This is especially useful if you want to closely monitor access to the network.