Testing Chatter in a Sandbox

I have a client who is exploring Chatter in a sandbox with a view to making a decision on whether to roll it out across the organisation. They have come up with a couple of issues which they would appreciate help on.

1 - Daily Chatter Digest. They aren't receiving the digest email. We've turned on email from Setup. It seems that the only person who can receive the digest email is the person who created the sandbox. This kind of makes sense but they wanted to be sure this was the case, and that it would all be OK in production. Does anyone have experience of this?

2 - They are using 'Follow' to follow Contact records. There doesn't seem to be a way to get a list of all the Contacts that they follow. I've suggested that this seems to be the case but they want confirmation. Does anyone have experience of this?

Thanks in advance for any help.