The age to be a legal adult in the US is 18 and so I believe that it makes sense to lower the drinking age to 18. In college campuses, many parties are held throughout the week and it is more than likely that underage drinking is occurring. Now, students have to worry about getting caught drinking while trying so socialize and have fun. If the drinking age was lowered to 18, students would have a better time socializing and not have to worry about cops crashing the parties.
Lowering the drinking age in the United States from 21 to 18 won't improve socializing whatsoever because the two do not correlate. The amount of alcohol consumed at a younger age doesn't encourage or discourage socializing. In order to make socializing better, why not try putting down those laptops, iPads and cell phones to try talking face-to-face.