That's just not true. I'm a current two-time intern at Marathon and never once have they made me or anyone that I know post these. In fact, I know of an instance where another co-op asked if they had anything we could share on our social media channels.
Another company I interned for provided similar materials that we COULD use if we wanted to, but again, it wasn't mandatory.
Sounds like you are disgruntled, or just here to complain for the sake of complaining. I bet you're not complaining about the $35/hour or more you're getting paid to INTERN at Marathon? Or, the real-time work experience you're gaining, or the contacts you're going to make working for such a large company?
Just come on!!!