Hey Colin,
Do you want to selectively reset for specific users? It can be done from the user's listing,
http://take.ms/c3Mty . However, if you want to reset everyone's points, you need to manually run a SQL query instead because we don't think it is a good idea to display such actions to any admins :x
If you want to reset points for all users on the site, you can run the following SQL query and you are good to go:
[gist]
truncate table #__social_points_history;
[/gist]
Replace #__ with your table prefix though.