I still wouldn't want someone else to be able to register for some service using my email. What happens if I want to use the same service in the future? That h

I still wouldn't want someone else to be able to register for some service using my email. What happens if I want to use the same service in the future? That happens to me all the time as I have a very generic email address (one of the first users of Gmail). Someone seems to have registered to Facebook with my email and now I can't disassociate it. People searching me by my email address on Facebook end up with that random guy.