Don’t use your corporate logo, use your own picture on twitter, facebook and all the other social networks.
People socialize, companies don’t. Listen to Jim and Travis from Gravitational Marketing, they know what they are talking about.
My profile picture sucks (you don’t have to tell me), but at least it’s me. I am using the same picture for my blog, twitter and facebook. This way, I am doing branding when I am socializing.
I suggest you do the same. People want to know you, and from you, they’ll get to know your company.