DO you operate an electronic bulletin board service in Hongkong? If you do, then we want to hear from you. There are more than 300 bulletin board services in the territory, operated by all sorts of special interest groups. Just as the number of personal computers (PCs) in Hongkong has grown, so too has the number of bulletin boards in the territory, and the number of active users of the boards. Bulletin board services (BBS) are big news. Each time my colleague Larry Campbell and I have either written about the electronic services in Technology Post, or featured BBS's on our Monday evening radio programme Dataphiles on Metro News, the level of interest generated has been huge. We would like to hear from you, so we can put together a definitive guide to Hongkong's electronic community. If you are a BBS system operator, let us know - so we can let Hongkong know about you. And if you are new to the concept of the bulletin board and the world of dial-up data and you want to know more, why not let Larry and me know the kind of information you have been trying to track down to get started on the boards. Write to Technology Post , G. P. O Box 47, Hongkong. Or send us a fax on 811-1278 or 811-1048. SEX sells, like it or not: magazines, videos and the ''naughty'' telephone services devoted to the practice make plenty of money for their providers. The next generation of multimedia computer systems - those that integrate sound and video - is no different, as producers of an intermedia exhibition in San Jose recently discovered when they offered a conference session titled Multimedia Erotica. ''We got a huge response, much more than we expected,'' a spokeswoman for the exhibition organiser said, although she admitted the topic was ''a little off the beaten track'' for a computer show. ''The opportunities for publishing here are unbelievable,'' the spokeswoman said.