First, navigate to the “Reporting” section of your desired giveaway. Go to Account > Entries.
You can set a filter to only show results from one entry method type i.e. Facebook Like, Twitter Follow, Email Subscribe, etc…
You have two options on how to do this.
1) Click the “View all entry types” link, then click on the entry method you want.
2) Scroll down to the “Action” column, then click on the entry method type.
Now you can view every user who entered with your selected entry method.