Anyone running this on vB 4.1.4 and having problems with the tweetbox not showing might want to try this solution.
AdminCP > Plugins & Products > Add New Plugin
Product: vBulletin
Hook Location: member_build_blocks_start
Title: Load About Me Tab By Default
Execution Order: 5
Plugin PHP Code:
Code:
if (!$vbulletin->GPC_exists['tab'])
{
$vbulletin->GPC['tab'] = 'aboutme';
}