Web is full of people doing the same thing: Sharing the same links, tweeting the same ideas, giving the same comments. There's also loads of people afraid of showing their personality and passion. You don't need to be one of them. Not even if you are a "serious" business person.
Being enthusiastic about what-ever-might-make-you-enthusiastic gives you a certain glow. You will stand up from the crowd. You will make people your friends and followers interested or even enthusiastic about what ever you are sharing.
Find your passion, and be passionate about it. Have fun and show it. Have a personality. Glow.