They Don’t Like Surprises: Prevent any surprise-induced mishaps by following a two-step process: 1.) Ask the person before you submit their information as referee.
2.) Hold onto their information until an employer asks for it, then give your referee a head’s up that a call might be coming.
Help Them Help You: Instead of leaving it up to your referees to search for good information to share about you, give them a cheat sheet. Giving them your resume would be great, your referee will be able to study up on your career goals, experience and skills without having to dig up information on you from your LinkedIn page.