Was the White House aware that they were being invited to attend the event and their questions pre-screened?

WHITEHOUSE: Press Briefing

Which means that politicians should never allow themselves to be questioned directly over Twitter, for they will indede be bombarded by these sorts of tweets, tweets that cannot be pre-screened as email can.

FORBES: How Not to Use Twitter in Politics

Now, first of all, we haven't pre-screened anybody.

WHITEHOUSE: Town Hall in Los Angeles

There are no rules, nobody has been pre-screened.

WHITEHOUSE: Town Hall in Arnold, Missouri

His company, Verified Identity Pass , a screening service that's created an express lane at airport security posts for pre-screened passengers deemed safe by the government, has effectively been cleared to take off past its initial successful test run in Orlando, Fla.

FORBES: Magazine Article

This year 108 documentaries submitted by 72 different organizations from 30 countries were presented for the Grand Prix, out of which 10 were pre selected, screened and considered for the awards.

UNESCO: Communication and Information