It was, until the events of the mid-2010s when most of the science fiction fandom community quit it and went over to Facebook, presumably because that was more convenient (i.e. on it already) than going to e.g. Dreamwidth (a LJ-alike that is still going). It operated in a very similar way to FB but somehow much more focussed maybe because it never got the 'businesses having pages on there' bit. Those of my friends who were on both, often used FB more as an events calendar than all-around social media.