Basically title (s/left/right/g for RTL languages, naturally).
The affected CSS rule is the #personal h2 one.
One "fun" thing to note is that the user-grey image is 20x20px but SocialProfile's smallest (s) avatar size is 16x16px and the next one, medium (m) is 30x30px. (Shockingly this is documented on-wiki, even!)
TODO: If SocialProfile is installed *but* the user has *not* uploaded a custom avatar, should it show the default SocialProfile avatar image or the user-grey image?