Both the social networking sites were flooded with the rumors of Cosby's death Aug. 27. With people questioning whether or not the news of his death was true, the hoax about Cosby's death quickly became a trend.
However, the 73-year-old comedian, well known for "The Cosby Show," is alive and well in America.
"RIP Bill Cosby sad your time is now and you too Bill Nye the science guy I loved your shows," tweeted SoTheRealSweede.
"Rip bill cosby :( #lovedYourShow," tweeted Jamie Booshh.
"RIP Bill Cosby. Always my favorite actor," tweeted Saint Matthew.
"RIP Bill Cosby!! u will forever be remembered, I grew up listening to ur music, I even got Ur album thriller, I love u," tweeted Hakeem Muhammad.
However, there were many Twitter users who were not convinced by the phony news of Cosby's death.
"BILL COSBY IS NOT DEAD!! I REPEAT, HE IS NOT DEAD! ONCE AGAIN, HE IS NOT DEAD. HOLD UP, ONE MORE TIME...HE....IS....NOT...DEAD!!!!!!!!!!!!!!," tweeted one Twitter user.
"Bill Cosby is alive. Stop with the death hoaxing. It's not even funny," tweeted Kevin C. Johnson.
"Bill Cosby got Eternal life, y'all niggas know damn well he ain't dead. He right there with Morgan Freeman," tweeted The Flyest MC.
"And Bill Cosby is not dead...i repeat...NOT DEAD....Twitter need a life sentence for all these murders mayne," tweeted Peter Johnson.
This was not the first time when Cosby became a victim of Internet death hoaxes. In August 2010, "Bill Cosby Died" became a top trending topic on Twitter. He reportedly had to confirm as many as four times that he was still alive.
"I don't want [whoever spread the rumor] to do this anymore, because this is my fourth time being reported [dead]," Cosby told CNN.
"I don't know. Maybe a psychiatrist will say I'm feeding [the rumor starter's] ego, but I just want to say to friends of that person: Just tell him to stop, because it isn't funny," he added.
Cosby's response came after one of his close friends was left in tears, assuming that the rumor of Cosby's death was true.
"Emotional friends have called about this misinformation," Cosby said on his Twitter account. "To the people behind the foolishness, I'm not sure you see how upsetting this is."
Cosby is among many celebrities who have become victims of social media death hoaxes - Bill Nye the Science Guy, Kardashian mom Kris Jenner, Denzel Washignton, Eddie Murphy, Adele, John Witherspoon, Taylor Swift, Justin Bieber and Lady Gaga - to name a few.