What Use Is An F-call?

What use is an F-call? I've just had a browse through the latest Amateur Radio magazine, read a few stories, looked at a couple of photos and it struck me that there are two types of activities that Amateurs get up to. There's the social activities, where several amateurs, even groups or hordes - hmm is that the word, a horde of amateurs - get together and have a party. They build a station, either on the back of a trailer, a ute, a tent, a mountain, a boat, you name it. They erect, generally more than one, antenna structure, some go over the top and set-up about 15 different antennas - but the passion that underlies all that is held together by the social glue that makes up this hobby. Generally a station built like that has some or other purpose, be it to activate some long lost atoll, or a special event call-sign, a particular day, or event, to memorialise some past history. Any number of different reasons to get together, build stuff and get on-air. The other type of activity is much more insular. Sit