How does one obtain a temporary tourist visa for someone who wants to visit the united states coming from the philippines?

You cannot apply visitor's visa for other person. This matter needs to be done in person only.
For information on how to obtain B-1/B-2: Embassy of the United States in Manila : Nonimmigrant Visa (http://manila.usembassy.gov/wwwhniv7.html)

It is not easy to prove ties to his/her home country and the chance to get an approval is somewhat slim. It's easier that you go visit your friend there.