According to Adam Mosseri, Head of News Feed, Facebook will sample a new set of users each day.
"There is always the risk that people will try and game any system. In this case we (1) randomly sample people, (2) actively work to de-bias the data so it's representative of the population and (3) re-run the surveys every day," Mosseri tweeted on Thursday.
"It's worth noting this isn't a rating system, nobody can opt into rating a publisher as trustworthy.
"We randomly sample new people each day, and only their responses are used. I'm sure some bad actors will try and game the system, but it's not as easy as you suggest," he tweeted to one user who criticised the survey.
The two survey questions are: "Do you recognise the following website? Yes or No" and "How much do you trust each of these domains? Entirely, A lot, Somewhat, Barely, Not at all".
Facebook CEO Mark Zuckerberg, in a lengthy post last week, revealed about the survey to determine sources that are "broadly trusted".
"As part of our ongoing quality surveys, we will now ask people whether they're familiar with a news source and, if so, whether they trust that source," he posted.
"The idea is that some news organisations are only trusted by their readers or watchers, and others are broadly trusted across society even by those who don't follow them directly," he added.
"This update will not change the amount of news you see on Facebook. It will only shift the balance of news you see towards sources that are determined to be trusted by the community," Zuckerberg noted.
The additional information about a news article will be pulled from across Facebook and other sources to identify and remove false news.
The other sources are information from the news publisher's Wikipedia entry, a button to follow their Page, trending articles or related articles about the topic and information about how the article is being shared by people on Facebook, the social media platform said in a blog post on Friday.
"In some cases, if that information is unavailable, we will let people know, which can also be helpful context," the Facebook blog post added.
The move is important in the wake of the Las Vegas shooting where Google, Facebook and Twitter failed miserably to stop publishing fake news on their platforms.
Facebook's "Security Check" page -- that lets people involved with disasters and accidents post messages for friends and loved ones -- published a blog post from "Alt-Right News" that said "the killer may have been a Trump-hating American television host Rachel Maddow fan" in an apparent reference to the misidentified killer's Facebook page.
Facebook said its security staff saw the post and removed it.
"However, its removal was delayed by a few minutes, allowing it to be screen captured and circulated online. We are working to fix the issue that allowed this to happen in the first place and deeply regret the confusion this caused," Fast Company quoted the social media giant as saying.
"The new button reflects feedback from our community, including many publishers who collaborated on its development as part of our work through the Facebook Journalism Project," Facebook said in the new blog post.
Helping people access this important contextual information can help them evaluate if articles are from a publisher they trust, and if the story itself is credible, it added.
In a blog post on Wednesday, Facebook executives said they had heard from people how frustrating it is to click on a link that leads to a slow-loading webpage.
"In fact, even more broadly on the Internet, we have found that when people have to wait for a site to load for too long, they abandon what they were clicking on all together. As many as 40 per cent of website visitors abandon a site after three seconds of delay," the blog post read.
Facebook will take into account the estimated load time of a webpage that someone clicks to from any link in News Feed on the mobile app.
"Factors such as a person's current network connection and the general speed of the corresponding webpage will be considered," the social media giant noted.
If signals indicate the webpage will load quickly, the link to that webpage might appear more in a user's News Feed.
Facebook said it had taken similar factors into account in the past also to ensure people quickly see relevant stories to them.
"For example, if you are on a slower Internet connection that won't load videos, News Feed will show you fewer videos and more status updates and links," the blog post read.
In order to load stories faster on a poor Internet connection, Facebook said it prefetches stories by downloading mobile content before someone clicks a link.
This, the company said, can shorten load time for webpages by more than 25 per cent.
They can now share this content to a Snapchat clone called 'Facebook Stories' that appears above News Feed on mobile and works similar to Instagram's 24-hour slideshows.
Users can also share these posts to News Feed of individual friends through the new 'Facebook Direct' private visual messages that disappear after some time.
"As people mostly post photos and videos, 'Stories' is the way they're going to want to do it. Obviously we've seen this doing very well in other apps. Snapchat has really pioneered this," technology website Tech Crunch quoted Facebook Camera product manager Connor Hayes as saying.
He said Facebook was shifting away from text status updates after 10 years as its primary sharing option.
According to Hayes, the rapid ascent of Instagram Stories to 150 million daily users inspired the Menlo Park social media giant to start testing its own Stories in January, and keep expanding it to 12 countries before rollout.
"We've tested in markets with Instagram Stories and Messenger Day, and we've seen this as accretive. They end up posting more and they like using the 'Stories' format across apps," Hayes added.
WhatsApp recently received thumbs down when it changed from a text-based to a stories-based status update.
The company brought back the text-based status update feature last week.