If you want to add the same note to different contacts you create a batch note, to do so you select the contacts you want to add the note to and click on the Batch menu to get the option for "Batch note": 

Once you add the note information, you can choose to pin the note, which means it will be on top of the activity feed, or you can also assign a follow up task with the note: 

Remember to hit save note to make sure the note is in the contacts profiles

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