Why is Twitter Banned in the White House?

Twitter seems to provide the US president Barack Obama the largest platform online to make his opinion public. Same with White House. They both have a combined, mind blowing 2.6 Million Followers and growing. But then if that’s so, then why is it banned in the White House?

White House Computers have been blocking twitter. No Reason Stated but it’s quite obvious that this may be done to not allow Secret of the White house from Being Leaked! But if Obama can keep up a Blackberry with him, the people at White House better think of a way to get twitter working out there!

Here’s a Video from Youtube where the White House Press Secretary tell us about Twitter being blocked in the white house.