The green bars indicate reputation and are gained by receiving "thanks" or by receiving a "thumb's up" on a post. The reputation has no effect on the title.
Different titles (or ranks) are achieved by a higher post count. Spacetime employees have their own titles and there are some special titles as well. See the following guide on that by the sexy DocDoBig: http://www.spacetimestudios.com/show...Titles-(Guide)
Basically, both are completely meaningless attributes that only exist to boost people's ego, so pay no attention to them.
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