Just wanted to let you know that we just released the VirtueMart profile plugin. This plugin will not automatically insert Like button's on products, but will make the registration process much easier for prospective users by cutting down the amount of information they must add (pulling city, country, name, etc) from their Facebook profile.
For more information, see our forum post regarding the update. We'll be adding more documentation soon:
www.sourcecoast.com/forums/topic?id=1920&p=1#p10705
Thanks,
Alex