Anime and the Internet

I’m looking for an anime where the Internet is the main plot driver or at least a significant constant factor to the plot. An example of an anime where the Internet is the main plot driver would be Summer Wars and an example of an anime where the Internet is a significant plot driver is Durarara!!. Unfortunately anime in which the Internet only serves as a minor plot point (Steins;Gate, Eden of the East, Welcome to the NHK, etc) are unacceptable so please don’t recommend them unless you feel you have a very good reason. Also, virtual worlds aren't okay if it's too insular and there's no general feeling that the characters are connected to the wider world.

Manga suggestions are fine so long as they’re not ongoing. I'm already aware of Summer Wars: King Kazuma vs Queen Ozu.

Please make sure to check my MAL. If there are any anime in my Plan to Watch list that you think fits what I’m looking for then please point it out to me. I'm already aware of Sword Art Online and Accel World.

Thanks.