Contact List includes contacts that were added by you or Contacts who added you as a Contact.
Contact List is your entry point to start communicating with people from your Contact List. From here you can also manage your Contacts.
Clicking on Actions︙ near a Contact will open an action list where you can:
Chat to chat with a Contact.
Call to start a direct call.
Edit to change Contact profile information.
Delete to remove Contact from the list.
For Contacts without Connect, the Chat option is not available and Actions︙ will look like: