Friending is so different than Following. I was talking through this with a few different founders over the weekend. Thinking out loud late on a Sunday night:
With “friending” as on LinkedIn, Facebook you are establishing a fact. You say “we’ve met in the past and want to be formally connected in case of something useful happening in the future”. On LinkedIn, this means the people you connect with can help you in finding a reference, a job, a new employee, etc. On Facebook it means something your friend does may show up in your news feed if relevant and you are ok with them seeing what you share.