Twitter is becoming more available to even those who don't tweet with search deals popping up, real time search of tweets, and widgets. This makes what you say that much more available to your potential client. All too often I see people who are representing a company or a brand get caught up in how casual their tweets become. You may feel that the $&@"?! waiter is giving you bad service, but is that something you want your brand to say? Even if you are only sending out personal tweets, a Google search later shows your potential employer that they don't want to hire you after seeing how much bad-mouthed your old job.
I'm not implying you can't say something funny to your friends, but be careful of what you tweet because it's out there for all the world to see.
Posted from my iPhone