Optimizing your LinkedIn profile, building your number of contacts, and participating in groups are all actions to contribute to raising your LinkedIn visibility. But visibility and credibility go hand-in-hand. Credibility is key so those who view your profile see immediate social proof of your expertise. Compiling LinkedIn recommendations is among the best strategies for raising credibility. Related: 3 Things Your LinkedIn Summary MUST Say Here are five tips to ask for – and get – a quality LinkedIn recommendation.