Not sure why you would want to do that. You should let the member choose who they want to follow. I know if I signed up for a site and all the sudden I was friends or following everyone on the site that I didn't pick myself, I would probably delete my account right then.
Yes I agree with what your saying as for most public social networks that would be the case. I should have been a bit more clearer. In my scenario the site is private and purely for family members (I have quite a large family spread across the globe) with the intention of everyone seeing what everyone else is upto. Hence new member have to follow all existing members to keep up with everything that’s going on.
Was wondering if there was a way of making Following opt-out as opposed to opt-in?
It seems like this will do what you need for making everyone on the site friends. It says you can "create" a list of members to be friends with each other so, maybe ask them if it is possible to do this automatically instead? Just a suggestion.