The band thanked fans for their support following the positive reaction to their brief reunion, which helped bring London 2012 to a close.
Victoria Beckham tweeted: "I was a pop star for the night!! I love u @MelanieCmusic, @OfficialMelB, @GeriHalliwell, @EmmaBunton!! we did it!!"
The fashion designer later added a picture, saying she felt "totally overwhelmed" following the performance. "Thank you so much to all of our AMAZING fans, I love u, VB x," she said.
Mel C said: "What an honour to represent our country and perform for all of the incredible Olympians. We salute you one and all #coloursoftheworld x x."
Geri Halliwell wrote: "That was amazing!!!! Thank you all , we love you!! xx."
Meanwhile, Emma Bunton revealed how the band partied "till the break of dawn", joking about how Mel B was still in her outfit from the show.
Mel B, who uploaded photos of the band with Liam Gallagher, added that she had "soooo much fun" on stage.
The Who, Muse, Jessie J and Queen were among the other performers at last night's ceremony, which will be released on DVD.
Photo Gallery - London 2012 Olympics Closing Ceremony: