Health blogger and app developer Belle Gibson hits back at 'bullying' critics

Belle Gibson, the popular health blogger accused of falsely claiming to have cancer, has blasted her critics for speaking out against her.

Breaking her recent social media silence, Ms Gibson lashed out at former friends and acquaintances who had publicly doubted her claims of being ill, telling them to "make yourself invisible to me".

The 23-year-old Melbourne woman founded health and wellbeing app The Whole Pantry, which has been under close scrutiny after it was revealed many of the charities the organisation had promised to donate to had not received any money.

The Whole Pantry app, along with a Penguin book of the same name, promoted healthy living and Ms Gibson boasted natural foods and alternative therapies had fought off the multiple cancers she claimed to suffer.

But serious questions have been raised over the entrepreneur's claims of surviving terminal brain cancer without treatment, as well as being diagnosed with four other types of cancer.

Former friends and work colleagues have accused Ms Gibson of lying about the extent of her illness, with some suggesting she may not have cancer at all.

On Friday night Ms Gibson hit back in a rambling Facebook post, sarcastically encouraging her followers to speak to the media if they needed to because "it says more about you, and your priorities than me or the story you'll get paid to tell".

Ms Gibson, who wrote of being "bullied to my death", went on to defend the work of The Whole Pantry.

"...I know the work my company and it's [sic] contents did changed hundreds of thousands for the better," she wrote.

In another post she said those who had spoken publicly about her were "knowingly contributing to the blatant attacking and bullying of myself and my family".

The Melbourne mother did not disprove claims she had lied about or exaggerated having cancer but promised an "open letter" was on its way.

Ms Gibson's latest comments, posted under a Facebook alias, follow the recent removal of thousands of posts on her social media accounts.

Fairfax Media has not paid anyone for information about Belle Gibson