Some 649 posts have been suggested to Facebook and Twitter, inclusive of false cures, anti-vaccination propaganda and conspiracy theories round 5G.
90% remained seen on-line afterwards except any warnings attached, the document suggests.
Facebook stated the pattern was once "not representative".
A spokesperson for Facebook said; "We are taking aggressive steps to do away with hazardous misinformation from our structures and have eliminated heaps of lots of these posts, such as claims about false cures.
"During March and April we positioned warning labels on round ninety million portions of content material associated to Covid-19 and these labels stopped human beings viewing the authentic content material 95% of the time.
"We will notify every body who has liked, shared or commented on posts associated to Covid-19 that we've got because removed."
Twitter stated that it was once prioritising the elimination of Covid-19 content material "when it has a name to motion that should probably reason harm".
"As we've got stated previously, we will now not take enforcement motion on each and every Tweet that includes incomplete or disputed data about Covid-19. Since introducing these new insurance policies on March 18 and as we have doubled down on tech, our computerized systems have challenged extra than 4.3 million money owed which had been focused on discussions round Covid-19 with spammy or manipulative behaviours."
chief govt of the Center for Countering Digital Hate, stated the corporations have been "shirking their responsibilities".
"Their structures for reporting misinformation and dealing with it are surely now not suit for purpose.
"Social media giants have claimed many instances that they are taking Covid-19 related misinformation seriously, however this new lookup suggests that even when they are exceeded the posts merchandising misinformation, they fail to take action."
Rosanne Palmer-White, director of adolescence motion crew Restless Development, which additionally took section in the survey, stated younger human beings had been "doing their bit to cease the unfold of misinformation" however social media corporations had been "letting them down".
Both Twitter and Facebook face questions from the UK's Digital Culture Media and Sport sub-committee on the way they are dealing with coronavirus misinformation.
MPs have been no longer completely happy with an previously session. They demanded extra specific solutions and stated extra senior executives must attend the subsequent meeting.
For the study, ten volunteers from the UK, Ireland and Romania searched social media for misinformation from the stop of April to the quit of May.
They determined posts suggesting victims can get rid of coronavirus by way of ingesting aspirin dissolved in warm water or by using taking zinc and nutrition C and D supplements,
Twitter used to be deemed the least responsive, with solely 3% of the 179 posts acted upon.
Facebook eliminated 10% of the 334 posts mentioned and flagged any other 2% as false. Instagram, which Facebook owns, acted on 10% of the a hundred thirty five complaints it used to be sent.
Both the social networks insist they have made efforts to carry pretend information about the coronavirus below control.
Twitter has begun labelling tweets that unfold misinformation about Covid-19. Facebook has additionally eliminated some content, such as from businesses claiming the rollout of the 5G community was once a reason of the unfold of the virus.
Analysis
By Marianna Spring, Specialist disinformation and social media reporterAll eyes have been on how social media websites have tackled deceptive data on their structures in latest weeks - and all eyes will be on them once more today, as they're grilled via MPs.
Over the direction of the pandemic, distinctive social media corporations have made a range of modifications to their insurance policies to strive to handle unsafe and deceptive information. Facebook and YouTube each say they have cracked down on conspiracies that may want to do damage.
And in a high-profile move, Twitter determined to label a deceptive tweet by means of US President Donald Trump - even though it used to be one about postal vote casting as a substitute than coronavirus.
But these adjustments in coverage do not appear convenient to implement. In practice, deceptive posts are regularly now not stated - or when they are, they are now not continually removed. The query of the damage one of a kind posts pose seems to be at the root of this problem.
Messages posing an on the spot hazard to lifestyles are eliminated greater quickly. However, deceptive messages that pose a much less instantaneous danger can show to be simply as unsafe - such as these from anti-vaccination groups.
The human value of misinformation observed that the attainable for oblique damage brought about by using conspiracies and terrible records that undermine public fitness messaging - or an high quality vaccine - may want to be huge.
And as misinformation about protests and different information activities floods social media, it will become obvious that the pandemic is simply one of many battles in opposition to misinformation to be fought.
