List filter question--Users who clicked an email/users who opened an email
Yesterday, I deployed a campaign through Marketo. Today, I wanted to send an email to all of the users who clicked on a link in that email. In building the list, I selected anyone who opened yesterday's email, with my thinking being that in order to have clicked a link, they would have had to have opened the email. However, I'm wondering if I'm not necessarily getting the users who clicked a link. In building a list of users who clicked a link in yesterday's email but were not sent today's email, I get quite a few contacts.
Does anyone have thoughts on this? Should there be a significant disparity in contacts who opened an email vs contacts who clicked an email? I realize they won't necessarily be one to one, but I wouldn't have expected to see a significant difference.