That's just incorrect usage of terminology by (most likely) marketing/PR people.

In the olden days, you had to log on to your ISP over a modem. "Logging on" happened all the time to access anything outside your computer.

I suspect that the occasional use of "log on" in reference to simply visiting websites will disappear in favor of simply "visit". "Log on" will continue to be used and abused with connection to sites that actually want you to log on (after all, what better way to turn your website into a money maker than by gathering user data).

> It's a lost cause. I'm saving my energy to preserve the distinction among "few", "fewer", "less", and "lesser".

This is reminding me of the article about the recent English grads who traveled the country correcting grammar and spelling errors in signs on the way.