Facebook and Twitter have not been invited to White House social media summit, sources say

(CNN)The White House has not extended invitations to Facebook and Twitter to attend its social media summit on Thursday, people familiar with the matter said. The White House has not yet publicly disclosed who it has invited. But the Washington Post reported last week that the White House has asked to the event a number of right-wing luminaries who have been extremely critical of social media companies. Some of these individuals have claimed, often without real evidence, that companies like Facebook (FB) and Twitter (TWTR) harbor bias against conservatives and censor their speech. The companies have denied those claims. Republican lawmakers and conservative media personalities have for years lobbed claims of anti-conservative media bias at Silicon Valley companies. But President …