ABC News says McCain and Stephanopoulos will come together online for a "Twitterview." It will be conducted at 12 noon Eastern time on Tuesday. The microblogging platform restricts each entry to 140 characters.
The public will be able to read the real-time 15-minute exchange by signing up at the Twitter site to follow both Stephanopoulos and McCain.
Meanwhile, Stephanopoulos is inviting everyone to "tweet" him proposed questions -- with a 140-character limit.
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