I wouldn't bother "advertising" unless you're looking at freelancing, it might come across as desperate. There are some places where recruiters will constantly

I wouldn't bother "advertising" unless you're looking at freelancing, it might come across as desperate. There are some places where recruiters will constantly look for candidates: LinkedIn, XING (not sure if it's worthwhile outside Germany), Github, maybe SO (not sure), possibly FB. Having a polished appearance there will yield plenty of contacts even without indication that you're currently looking for work (assuming hard skills that are in demand somewhere).