"This is largely, I think, a political event", said Michael Beckerman, the president of the Internet Association, a Washington-based trade group that represents Facebook, Google and other tech giants.
The technical problems come ahead of a social media summit at the White House later on Thursday.
"Project Veritas can be synergistic with the Trump administration to pull back the curtain surrounding Big Tech", O'Keefe said in a statement.
Initially, the White House had invited Ben Garrison, whose cartoons long have provoked the ire of groups including the Anti-Defamation League and Southern Poverty Law Center for including hateful imagery, including anti-Semitism. President Trump mentioned - in a tweet, for sure - that the event might possibly maybe maybe maybe be specializing in "dishonesty, bias, discrimination and suppression practiced by sure corporations". Social Media Summit highlights partisan approaches to Tech MORE on Thursday that point to its tendency to have typos in tweets and tell participants at a White House meeting of conservative social media personalities that "fingers aren't as good as brains".More news: UK PM May says she will leave disappointed after Brexit failure
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"We hardly do press releases anymore because if I put out on social media a statement, like I'm going to in a little while and something totally unrelated but a very important statement, now they're going insane", explained the USA president.
Trump has a following of about 62 million people on Twitter despite his claims that the company makes it hard for people to follow him.
Bizarrely a Twitter global outage coincided precisely with the the White House gathering and Trump also took the trouble to fire a warning shot to Facebook about its Libra cryptocurrency plans, which you can see below.
The people asked not to be identified discussing the president's use of social media. Two of the people said Parler in particular isn't ready. Mr Trump was due to deliver remarks on Thursday afternoon after the event.
A number of right or far-right figures, such as former Breitbart writer Milo Yiannopoulos and Vice Media co-founder Gavin McInnes, have been removed from social media platforms over the past few months.
When Mr Trump, who has more than 61 million Twitter followers, met with the site's chief executive, Jack Dorsey, in April, he spent significant time asking why he had lost followers, a source told Reuters.