Trolls used to live under bridges and be mean to characters in fairy tales, but now they're very real and live in the digital age.
They hide behind computer screens and send nasty messages to people far away without a care for their feelings. Mean. It's MEAN.
And now former EastEnders actress Daniella Westbrook has quit Twitter after getting "constant abuse" on the site.
The star even received death threats and claimed cruel taunts are "tipping me over the edge" after it emerged she's homeless and is living in sheltered accommodation.
Daniella wrote: "The person who's tweeting me telling me to go & o.d and do my kids a favour this Christmas. Please stop its really evil at this time.
"Coming off of Twitter as the constant abuse & people wishing me dead is tipping me over the edge. Have a good Christmas all."
The star is rumoured to be strapped for cash and is said to have signed up to Celebrity Big Brother just so she had somewhere to stay.
She denied she's appearing on the show in January and was forced to rebuff reports that she went on a spending spree last week after she was spotted shopping in Brentwood, Essex.