Danny,
Sorry for the delay in getting back to this post.
Adding the Like Button
To add the Like button, you'll want to edit the JomSocial user profile info module. This is usually at /components/com_community/templates/default/modules/profile/userinfo.php . In that file, add the following Easy Tag where you want the button to show:
{JFBCLike href=<?php echo 'http://yourdomain.com' . JRoute::_('index.php?option=com_community&view=profile&userid=' . $profile->id) ?>}There are a lot of options available for that tag for the styling and other tidbits, but that should get you started. Also, check the HTML on the page and make sure the data-href="..." value is proper for the user profile page (or that the previous Like count from before when you upgraded shows properly). If the URLs are different, the like count will be reset, so you'll want to make sure you're generating the same URL as before.
Changing the title in the feed
On the same page, add the following tag, which will have JFBConnect set your title how you'd like:
{SCOpenGraph title=<?php echo $profile->name; ?> is on xxxxxxxxx - Click here to enter xxxxxxx".}You can also change the description for the page to:
{SCOpenGraph description=<?php echo $profile->name; ?> uses xxxx because it's a great way to mingle with other martians.}
I hope that helps, but keep us posted if you run into any issues or have any questions.
Thanks,
Alex