Spirit guide contact, not imagination.
Did it feel like you were talking to yourself or another consciousness? A conversation that long is way more likely to be spirit contact than imagination.
Yes, sometimes spirit guides give names and sometimes they don't care what you call them.
As a spirit guide he would easily know about the internet. They have a higher perspective there.
And yes, amusing, funny spirit guides abound. When I'm doing a reading for someone I will sometimes encounter a guide that is really funny and I just laugh out loud at some of the things they're telling me. Some guides are stoic and analytical. There are all kinds. All of them desire to help however or they wouldn't be there.
Congratulations on the contact.