What web technologies to use for a big site?
What would be the best choice to build a huge website upon? Should I use a framework or build a completely custom platform?
I'm planning to build a very complex learning management site where main functionalities would be: videos, audios, quizzes, chats, payments, messaging, users can interact with each other.
One of the development companies I contacted said they would use WordPress for this, but I'm not so sure it's a good idea.
The website will have a large user base (millions) very quickly and I expect it to be very busy. I'm not sure WordPress can handle such a big traffic and user activity.
So what kind of technologies or framework would you recommend?