As seen on another forum, by TA staff TA_Mike:

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Tonight at 7:00pm US Eastern Time, our site will undergo some scheduled maintenance for approximately three hours. During that time, many features of our site will temporarily become "read-only," which will disable any features that write to our databases:

- You cannot submit new reviews, photos or videos

- New forum topics cannot be written (although you can browse existing forum topics/posts)

- You cannot vote or rate reviews or photos

- You will not be able to connect to Facebook during this maintenance period

- Mobile users will be unable to register, write a review or post to the forums

- Members in the midst of writing a review or forum post when the site maintenance goes into effect will have the chance to manually save their review/forum post to resubmit later.

There is no need to report any error messages or unusual behavior you might encounter during this time -- our engineers will be aware of any issues and they will make sure that everything gets back to normal as soon as possible.Thanks for bearing with us during these outages.