I am getting the same thing, but I don't think the answer is that the site is to blame. This is happening with many different sites on my phone, and I never even received this message until I completed the most recent upgrade on my S4.
When my phone is plugged in at night and I receive a text message or the battery is fully charged, the screen lights up and won't turn back off. How can I set it to turn off after the regular time out has passed?