The way we communicate (36) ……………. our friends has changed. These days, we have conversations on the computer or the mobile phone. We don't write (37) ……………. much more. We write emails instead. Internet sites (38) ……………. Facebook help us find old friends, talk with other people and join groups with similar interests. Facebook is also useful if you want (39) ……………. people to a party or a concert. The good thing is we can invite lots of people at the same time, so it's quicker and cheaper (40) ……………. sending lots of invitations.