Everybody who is anybody, and probably has no real mates, goes on about social networks like facebook, linkedin, and the many other varieties that exist here on t'internet and joking apart they do seem to be great places for 'networkers'.
Well here is moterus a social network for bikers based in Spain. Yes I know it's in Spanish but with a little bit of perseverance and the liberal use of Google Translator. You can find other bikers, set up or join groups, set up or search for routes with a really simple route planner and post up your events or look at what's on.
Give it a try. If you like it we might be able to persuade them to do an English version.