Context Aggregation and Analysis

This is a demo platform aimed to facilitate the verification of UGC image and video content posted on YouTube, Twitter and Facebook. In contrast to other approaches, which attempt to analyze the media items themselves for traces of forgery, this platform analyzes the media context: The characteristics of the poster, any relevant user comments, the local weather reports at the time of the event, and other contextual pieces of information are aggregated and presented to the user for analysis. To test the service, simply copy and paste a YouTube, Facebook* or Twitter URL for videos into the box or a Facebook or Twitter URL for images, then click "Verify"

*Right click on the Facebook video and copy the video URL

Contact: {olgapapa,papadop}@iti.gr

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Info! You have to select type {image/video} of input

or have a look at some explanatory examples below


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Lion Takes Revenge On Trophy Hunter. Video has been edited by Woolshed Company as part of the viral experiment project.

CCTV Footage claimed to depict the 2016 Brussels Airport explosion. The video is in truth from a 2011 attack in Moscow.



Info! In order to process Facebook videos you have to login first!

Search in Twitter

Tweet contains embedded YouTube video. Submit the YouTube video to CAA for analysis here

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× Warning! Video thumbnail set by uploader (in red border) is not present at the video. This tactic is common in clickbaiting.

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    *Tweets may be added outside viewport. Click 'Reset Zoom Level' to reset zooming scale and inspect all tweets.

    × Info! Provides information on twitter traffic around the video, and aggregate verification information on any Retweets, calculated using CERTH's Tweet Verification Assistant. Due to retweets containing the exact same tweet text, the veracity of the tweet depends on the user profile
    × Info! Only a representative sample (10) is shown.If you want to see all the tweets in the timeline graph Click here
    × Info! Due to large number of tweets only 500 of them are displayed in the timeline. If you want to get next 500 Click here
    Timeline of Tweets

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    Wind speed is caused by air moving from high pressure to low pressure, usually due to changes in temperature. Beaufort: More

    Cloud cover values only vary by 0.03 from year to year, whereas the local, day to day variability in cloud amount typically rises to 0.3 over the globe. Most data sets agree on the fact that the land is covered by 0.10-0.15 less cloud than the oceans More

    The international definition of fog is a visibility of less than 1 kilometre (3,300 ft); mist is a visibility of between 1 kilometre (0.62 mi) and 2 kilometres (1.2 mi) and haze from 2 kilometres (1.2 mi) to 5 kilometres (3.1 mi). Visibility of less than 100 metres (330 ft) is usually reported as zero. More

    General information about the video and the channel it was uploaded, extracted from its YouTube context. For values that are not provided, the corresponding fields are left blank.
    NOTE: Video Upload Time is in GMT.

    These are all the comments that appear under the video. User name and date/time are provided. Comments are further filtered into Verification-related comments based on the presence of verification- related keywords, such as “fake”, “confirm”, or “location”. Free-text search with keyword(s) is provided.

    These thumbnails are produced automatically by the video platform (YouTube or Facebook, respectively). There is a fixed number of them, as decided by the platform, extracted by regular time intervals through the video. Click the "Reverse image search" link to run an image-based search through Google.

    Weather information, provided by Dark Sky. You can contrast the historical weather data for the time the video was supposedly shot, to the weather displayed in the video. Suggested location names and date-times are extracted from the contextual information, but if these values are not correct, you can manually provide your own. If a specific time is given, the service provides the weather at that time. Otherwise, it provides an overall report for that day”.

    Provides information on twitter traffic around the video, and the possibility to perform further verification using the Tweet Verification Assistant

    This is an interactive visualization of all Tweets sharing the video. Click on any one Tweet to see the original post.

    Statistics of the credibility scores of Tweets sharing the video.

    Indicates whether the video represents licensed content, which means that the content was uploaded to a channel linked to a YouTube content partner and then claimed by that partner.

    Pages with a large number of followers can be manually verified by Facebook as having an authentic identity. This field indicates whether the page is verified by this process.

    Indicates whether the video is available in 3D or in 2D.

    Indicates whether the video is available in high definition (HD) or only in standard definition. Valid values for this property are: hd and sd.

    The last time the video or its caption was updated.