@Astroreaper Ha maybe, I'm not sure! It's ages since I gave blood. Next time I'm at the Docs I'll find out 
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
@Astroreaper Ha maybe, I'm not sure! It's ages since I gave blood. Next time I'm at the Docs I'll find out 