If you're not worried about the students not knowing who is going to get their note, Google Docs would work. Thinking about how we've done note pass in PLN, usually students just pass their note around the table. In Google Docs, the teacher could have each student start a document (if he/she wanted a quote or prompt at the top, the teacher could start the doc and share it with the kids and have them make their own copy). Students could write their own ideas and then share their document with the student next to them, who then adds the next part. This would require some management and instruction the first time, but so does the traditional note pass activity.