[Schwolop]

I tried for a while putting in big letters "Please do not offer me jobs for less than $n" (with n about 80% of my salary at the time) on my LinkedIn profile, but it had absolute zero effect on recruiters. Presumably they don't manually read the profile at all, rather just skim for keywords.

[mooreds]

I did the same with location and had much the same result (the entreaty was ignored).