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Charlie Sheen is about to give nearly 8 million people a giant kiss-off -- he's shutting down his Twitter account ... TMZ has learned.

Sources close to the former warlock say @charliesheen will close up shop within days, or possibly mere hours ... because Charlie feels like he's not getting anything out of the social network. No offense to his 7,707,791 followers, we're sure.

Charlie started his Twitter page on March 1, 2011 -- back in his crazed "winning" days -- and attracted more than a million true believers in 48 hours. For the record ... his first tweet was a pic of Charlie with his then-goddess Bree Olsen.

What will his last tweet be? Stay tuned ... has been hyping that Charlie Sheen will be the 'Social Media Ambassador' of the 1,000th edition of WWE RAW. He currently has over 7 million followers. WWE can't be pleased with this. LOSING!