Discussions about Hiring and Hiring Practices

[rampackfan]

This really may not be the place for my question but I cant find another thread response. I am pretty new here LVL 31 and still have very much to learn. How is it that a neighbour comes to my farm and works my crops without an invite. The only Invite I sent out was the challenge to non players in my contact list. And also how do I invite my neighbors when I want them to work my farm.
thank you for your time and attention to my questions