For a website which is largely database navigation and which you want to attract search engines to, you want to make sure that as much of the website is available without requiring a login as is possible.

For instance, if you’re developing a restaurant review website (ahem), you really want to make sure that the information about the restaurants is available without making the user login. You probably want to have a few features like rating or reviewing a restaurant that will only be available to logged-in users, but the display of the restaurant’s information should look as similar as it can between the logged-in and not-logged-in cases.

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