What you need to know about recruiters . . . If you are job hunting, you should send your resume to recruiters.
Different recruiters know about different positions.
This is particularly true with retained firms. By sending your resume out widely, you will be placed in many different confidential databases and be alerted of many different positions. If you send your resume to only a few, it may be that none you send to will be working with positions which are suited for you. Throw your net widely. If you change jobs, it is also wise to send follow-up letters to the recruiters and alert them of your new career move.