Yes, a friend can write a letter of recommendation for you, but it is generally more effective to have someone in a professional or academic position write it.
Yes, I can write a letter of recommendation for you.
Yes, I can provide a letter of recommendation for your friend.
Yes, I can write a letter of recommendation for a coworker.
Yes, I can write a letter of recommendation for a student.
Yes, I can write a recommendation letter for a student.
I am happy to provide a letter of recommendation for you as a family friend.
I am happy to provide a recommendation letter for you.
Yes, I have someone available to write a letter of recommendation for me.
Yes, I can provide a letter of recommendation for a student who is a family friend.
Yes, I can write a recommendation letter for you on LinkedIn.
Yes, a postdoc can write a recommendation letter for a job application.
Yes, an academic advisor can write a letter of recommendation for a student.