Facebook is the most effective way for politicians to reach 19- to 29-year-old Americans, according to a new survey by the Harvard University Institute of Politics.

The survey found that 27 percent of 19- to 29-year-olds — called Millennials by marketers — in the U.S. believe Facebook, other social media and blogs together have more of an impact than any kind of in-person advocacy in election campaigns.

Usage of Facebook by millennials has grown to 80 percent from 64 percent over the past year, and 90 percent of all of the current college students polled by Harvard have accounts on the social network.

Growth in Facebook usage outpaced that of Twitter by a three-to-one ratio among those surveyed by Harvard. The percentage with accounts on the microblogging site grew from 15 percent to 24 percent over the past year. Some 2,091 millennials participated in the poll.

It’s interesting, but necessarily surprising, how a poll overtly intended to measure political opinions — oh yeah, millennials’ approval of President Barack Obama’s performance went up — had to give so much of its focus over to Facebook.

Readers, what do you think of these findings?