Exclude some, not all, user profiles from search engine results Is there a way to let users choose if they want their user profile to be excluded from external search engine results? Any modules or hooks known?

It should be based on the de/selection of a boolean field "Display my user profile in search engine results".
There is and there is not, there are two sides of that question.

Bad side is - external search engines are just that: external. You can send them suggestion but you cannot make sure they respect them.

Good side is - you can create a field, and if it's checked output: &lt;meta name="robots" content="noindex" /&gt; Some search engines, including Google, Bing and apparently Yahoo! (can't find a link for that one), will respect that.