Papadopoulos and his presence at that meeting (with Jeff Sessions) was all over the news last fall.

Not sure why.

more or less in the same league with Louise Mensch and Claude Taylor. https://slate.com/news-and-politics/2017/12/sharing-seth-abramson-not-once-not-ever.html So you might take his tweets with a grain of salt...

That meeting, including that very picture, have been widely reported and commented upon by virtually every news organization, which you may easily confirm in a few moments with Google.

Not sure how you missed it.

https://www.cnn.com/2017/11/02/politics/jeff-sessions-congress-russia-trump-campaign/index.html

According to court filings unsealed this week, Trump campaign foreign policy adviser George Papadopoulos suggested at a March 2016 meeting that he could use his connections to set up a meeting between Putin and Trump with the then-GOP candidate's national security team. An Instagram picture on Trump's account shows Sessions attended the meeting at which Papadopoulos made the suggestion.

https://www.cnn.com/2017/11/14/politics/sessions-trump-russia/index.html

On Tuesday, Sessions said he did in fact now remember that he was part of a March 31, 2016, meeting that included both then-candidate Trump and a foreign policy adviser named George Papadopoulos.

https://www.cnn.com/2017/11/03/politics/jd-gordon-trump-papadopoulos/index.html

Washington (CNN)A former Trump campaign adviser says Donald Trump listened to George Papadopoulos when he presented the idea of a meeting with Russian President Vladimir Putin.

"He heard him out," JD Gordon, a campaign national security adviser who attended the March 31, 2016 meeting, told CNN Thursday.

https://www.cnn.com/2017/11/03/politics/donald-trump-george-papadopoulos-meeting/index.html

Washington (CNN)President Donald Trump said Friday that he didn't "remember much" about the now controversial March 2016 meeting with his foreign policy advisers, including George Papadopoulos.

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You might consider googling “Trump papadapoulos March meeting” in combination with any news source you can think of, to see all of the ignoring they did.