Meaningful interaction with friends

I was thinking earlier about how useful it would be if we had the ability to leave a short status update. I've finally started getting hearts in my town today and more and more towns are becoming accessible but I was thinking of leaving a "thank you" message on my free land in hopes that people would understand that I'm getting stuff and gladly returning if I can. When I first started being able to collect from my characters I still couldn't access those users' towns so I didn't want then to think I was being a Scrooge because I hadn't hit them back yet. I hope to have everyone online tomorrow but so far I think I still have 10-15 users that are inaccessible. This is so confusing. I'm not even bothering to find out why some people are accessible and others aren't. I'm just glad I've finally been chosen.