If I have a custom object that has formulas pulling information from related standard, not custom, objects. Will our chatter plus users be able to see the information, or would they have to be full SF license's to see them?
Thanks!
Formula fields and roll up summary fields are evaluated without regards for field level or object level security. As long as the chatter user can see the record, has object level permission, and field level permission on the formula field, they can see the output of the field and filter on the field.
You can define the object and field permissions on the profiles that apply to those users. In order for this to work, your Chatter users must be assigned the "Chatter Only" (a.k.a. "Chatter Plus") user license. Please see the following for more details on the features that come with the different types of Chatter user licenses: https://help.salesforce.com/apex/HTViewHelpDoc?id=users_license_types_chatter.htm&language=en_US