The wall between the U.S. and Mexico that was built to keep people out of the U.S. most of the people coming into the U.S. just want a better life for themselves and the U.S. makes them into criminals. some people die trying to get here. The term Reverse Berlin wall gives the connotation of the cruelty of the wall.

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)