The activate_plugin() function accepts three parameters, but it emits the activate_plugin action with only one parameter. This can be confusing, but hooks sometimes use the same name as the function they come from, without passing the same parameters.
One way to get the difference between a network activation and a regular activation is to monitor the update_site_option and update_option hooks. Only one of them will fire, depending on the $network_wide parameter of activate_plugin().
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