Launched in August, Gab has become known as a safe haven for the "alt-right" movement dominated by the white supremacists who are helping fuel America's deepening polarization.
The social network currently has 100,000 members and another 200,000 on its waiting list, according to the company.
"All are welcome to speak freely," spokesman Utsav Sanduja, who is a Canadian-us-cHindu with roots in India, said.
Gab is unable to accommodate all those who want to join, he adds, because it is still in its test phase.
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One of the new "Gabbers," Richard Spencer, heads the white supremacist National Policy Institute, whose account Twitter has suspended.
Spencer, whose "Hail Trump" comments were seen as evocative of the Nazi era, joined the Twitter exile along with Milo Yiannopoulos, accused of fomenting a social media campaign against the African-American actress Leslie Jones.
Gab's appearance follows the launch two years ago of another free-speech labeled platform, Voat, which has had limited success.
But the new site comes amid escalating tensions and acrimony over politics in social media.
Reddit, an online news and messaging board, announced last month that it would crack down on "toxic users" in an effort to curb some incendiary comments from supporters of President-elect Donald Trump.
"We have identified hundreds of the most toxic users and are taking action against them, ranging from warnings to timeouts to permanent bans," Reddit chief Steve Huffman wrote.
Gab meanwhile pledges no censoring or filtering, allowing users to post messages of 300 characters, compared to Twitter's 140-character limit.
Despite its user base, Gab denies having a political agenda.
"Gab is for everyone and our mission is to challenge censorship on a global scale," Sanduja says.
"Whether it is from authoritarian governments persecuting their own people, politically incorrect citizens engaging in peaceful and civil discourse or whistleblowers in establishment institutions seeking a safe refuge, Gab will always be there for them and the people.
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