Hopefully you are right.

However, they list their trademarks on their terms of service. You can also find the scope of the trademark "Wall" at the www.uspto.gov.

My concern is that site owners have a lot invested in this product. The more anyone adds similar terminiology or functions the possibility that they can be pursued by Facebook as they become more and more aggressive in pursuit of intellectual property infringement.

I'm not sure if anyone here has the money to show a see more court that their use of the "Wall" in a social network setting is different then Facebook's use of "Wall".

I feel that it is better to be careful. It isn't like the old days when a person would just copy other websites and what they do.