Appearance of the share icons

Using the same theme, one of my sites displays this:

While another displays this:

Anyone know what controls this?

Many Thanks


There are different way to display the social sharing in Jetpack so you have to check your Jetpack settings.

Thanks, I thought I had looked everywhere in settings, but I finally found it. (under Jetpack | Settings | Engagement | Sharing | (dropdown) | configure your sharing settings | button style)