"I appreciate the wonderful support that I have received from so many people across the world over these past years", Manning said in a statement.
"I'm figuring things out right now - which is exciting, awkward, fun, and all new for me", Manning said in an email seen by The Associated Press.
The posts were accompanied by the words "First steps of freedom!".
After being forced to serve her sentence in jail for leaking classified secrets about the US military as a man, the transgender Chelsea Manning, 29-years-old, is finally "ready to be able to live as the woman that she is", as said by her lawyer Nancy Hollander.
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Manning, formerly known as Private First Class Bradley Manning, began her transition to becoming a woman after entering prison. She made two suicide attempts in 2016. Manning spent about seven years in prison, with Obama shaving some 28-years from her sentence in January.
"We are able to confirm that Chelsea Manning has been released safely from military prison", said Nancy Hollander and Vincent Ward.
She has detailed mistreatment in prison, which has included periods of solitary confinement.
Chase Strangio, one of Manning's attorneys with the American Civil Liberties Union, called her "a fierce advocate for justice".
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Over the years, Manning, who has had a Twitter account since 2013, has remained vocal about her imprisonment, transition, and politics. But Manning's sentence was commuted by outgoing President Obama, and as of today, she will return to private life.
Manning will be on "excess leave" while her court-martial conviction is under appellate review, US Army spokesperson Lieutenant Colonel Jennifer Johnson said.
One of the files released by Manning was a shocking 2007 video, "Collateral Murder", of a US helicopter killing 12 civilians, including two Reuters staff, in Iraq, noted Common Dreams in 2015; none of the usa military personnel involved in the killings were charged.
She was released on Wednesday after only serving seven years.
Amnesty International, which had campaigned for Manning's release, was quick to applaud her freedom but said the fight was not over.
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Consistent with Republican opposition to Obama's clemency for Manning, the Log Cabin Republicans was one group withholding applause for her upon her release.
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