"Follower" is a new field added to the contact filters and now smartlists can be created using this new Filter option for Contact Followers

Select the "Follower" field in the Columns Dropdown:

NOTE: Followers are exported as comma separated User Names in a single column

"Follower" is a new field added to the opportunity filters and now opportunities can be filtered on the opportunity Followers

Follower column is added by default when exporting Opportunities

NOTE: Followers are exported as comma separated User Names in a single column