Press u for group chat. Let's you talk to everyone that is the same job type as you. Another good tip is that you can put up a building sign while building your base. This stops people from raiding but make sure you don't have printers inside as that's not allowed. FYI, tip 13 is not allowed as then police/swat will then not be able to battering ram through if they attempt to raid your base. You can't have solid materialised fences now. The raider needs to be able to still see where to shoot. As the defender still has an advantage, 9 times out of 10 the space to shoot in for the defender is very small meaning that he will land more hits. Where the raider has to spray and hope for the best.