US President Barack Obama's interactive question and answer session with young voters on Thursday reportedly generated 92,000 tweets in two days.

The question and comment tweets were organised into various user-generated hashtag categories and were filtered as they were streaming in, after selecting the ones to pose to Obama.

The president fielded questions from a live audience at the George Washington University as well as Twitter users for an hour.

The show was streamed live on the web sites of the sponsors, Viacom's BET, CMT and MTV on Thursday afternoon.

Moderators for the Thursday's forum, which was intended to attract young viewers, picked questions from a Twitter tracker, which was opened on Wednesday, and from invited Washington area college students.

Answering a Twitter question on whether the president thought being gay or transgendered was a choice, Obama said, "I don't profess to be an expert. This is a layperson's opinion, but I don't think it's a choice.... We're all children of God."