As mentioned, GROUPS, join in, offer advice and opinions without being salesy and people will be more receptive. another good one I have seen is to get recommendations and link those to your website. They are much more credible than anonymous testamonials.
Yes, as annonymous testimonials can be written by anyone (even yourself) alot of linked in user are wise to this and look for testimonials from other members before they will even interact with a user. Very good advice IT Relocations, Be genuine and friendly and you are sure to make alot of connections! I hope you find this helpful.