The recommender should be direct, comment on project you have worked on, and a brief summary of your work style

Don't use LinkedIn.they are a means for your past, present and future employers to monitor your information, posts and views on there to use against you. Don't post anything or respond for anything can be used against you and you can lose your job or written up. LinkedIn is a monitoring website they track your IP address and emails etc and don't upload to them your ID it's a violation of your privacy and a risk for identity theft.

I did not hang around to get involved because LinkedIn is a wolf in sheepskin. They invade privacy and tried a number of times to invade my computer.