[OT] Adding recruiters to LinkedIn connection list?

[Michael ODonnell]

Over time, several recruiters (none of whom have ever actually
found work for me) have asked to be added to my LinkedIn
connections list.  I have so far not added them because my
involvement with them has been superficial and I generally try
to mention people on my connections list only if I've actually
interacted with them in some professional capacity.

It seems likely that there is (possibly substantial!) value to
a recruiter in being able to see my connections, but is there
value (or harm) to me?