Usuallly i go by number of posts or activity.
But generally just keep an eye on the member to see if they apply for memebership, and then stop visiting FTE, or if they are inactive for a year. I then remove them. I have more tollerance for more active FTE members then i do for newer members with fewer posts.
Like you have a post count of 4. which means your a pretty new member.

If your really intersted and joining and participateing in michigan FTE events, then click on the link in my signature here to join.