Those buttons are added automatically by JomSocial. If you don't want the buttons to be automatically added, you should disable the "Use JFBConnect" setting in the JomSocial -> Facebook Connect area.
As for spacing of the buttons, you can use the following CSS:
.social-login div {padding-left: 5px;}You can even target specific buttons, like:
.social-login .scFacebook {margin: 10px;}I hope that helps explain, but if you need more assistance, just let us know.
Thanks,
Alex