A technology revolution is happening on television. Network executives aren’t likely to be too happy about it, since, according to a researcher at the Massachusetts Institute of Technology, it will ultimately give science fiction fans more power over the television shows they watch.Fans have been using the Internet for years, and increasingly they have been going online to organize and mount often savvy campaigns to save favorite scifi series that come under the network axe.Using the Internet to raise large sums of money to advertise and advocate on behalf of series, fans have developed means and methods that rival political campaigns in their sophistication.Sadly, these efforts have often brought only heartbreak as the network suits ignore them and go ahead and cancel such series as “Angel,” …