Are you interested in a sysadmin for this wiki? I've been one for the past 3 or 4 years and also worked in Wix.com. I won't be a "real" admin, I'll just be the one who will fix all the tech problems plus do all the necessary coding. I'm the current sysadmin of The Big Bang Theory wiki so I have more or less experience on how the wikia operates. I can add anything else that this wiki needs(auto-refresh(if you don't have one), Fix the skin etc.).
The problem is not in how many neighbors you have, you can have 1,000 and still have this problem and it is not a problem with the game.
The problem is that your friends are not sharing or they have their FarmVille settings set to "only me", meaning that no one else can see / get the posts, so you do not get them.
Then different situation. My sister is also playing this game. For example we have the same player in our neighbor list and she can buy goods from that player and I don't? What can you say to that?
All I can say is we are offering suggestions as to what could be the problem based on our own experiences.
By The Way -- we are notZynga, nor are we affiliated with them in any way, and can not do anything to fix any problems in-game. We are a fan site for the game