Thank you! I really like nextdoor idea, but I have older phone. But I found SMS Neighbors to work pretty well for me - it is just sms sent to 512-789-1557 number and all neighbor receive it. Pretty interesting!
Why don't you start up a Facebook page for your neighborhood? It would be great to post lost/found pets, advertise garage sales, welcome new neighbors, post items for sale, arrange a block party, etc. Do a FB search for your neighborhood any you might find that someone has already made one. If you are not sure how to set one up, you may want to contact your favorite REALTOR who can set one up for you.