Stephen Brawn admitted to posting the footage online, but claims the woman- who cannot be named- consented to him having sex with her while she slept.
The woman had complained to the police that Brawn had raped her, after seeing the footage online.
'She wouldn't have consented to sex between them being videoed'
She had told officers she did not consent to having sex when she was asleep, and had not given her permission for the encounter to be filmed.
The woman said she only found out about the video clip when a relative spotted that Brawn, who is of no fixed abode, had uploaded it on to his Facebook page in May.
And prosecutor Charles Myatt said the woman claimed that she previously had no idea that Brawn had sex with her while she was asleep and had recorded it.
He added: 'She says she wouldn't have consented to sex between them being videoed while she was asleep.'
Speaking at the trial, Judge John Devaux told the jury: 'It is often said that the crown court is not a court of morals.
'He is charged with rape and you won't convict him simply because he put footage of the act on Facebook.'
Following the two-day trial at Ipswich Crown Court, a jury returned a unanimous not guilty verdict.
'I should never have been charged in the first place'
Brawn, 22, blasted the justice system, claiming he should never have been charged in the first place.
'I should never have been charged in the first place.
'I have been under a huge amount of stress due to this case hanging over me. I haven't been sleeping or eating properly for months.
'I got remanded in custody for two weeks after I was charged and I was banged up on the sex offenders' wing at Norwich prison.
'This case should never have gone to court if the police had done their job properly.
'They should have looked at this woman's other mobile phone which would have shown we had been swapping intimate pictures of each other.'