Twitter Users in Singapore

1. The Twitaholic.com Top 100 Twitterholics based on Followers in Singapore
2. Companies sometimes use different Twitter handles for different purposes:
   Starhub: @StarHub
   Starhub Customer Care: @StarHubCares

General

1. Tweet tips: Most effective calls to action on Twitter - May 14, 2013
2. The 2013 Twitter Marketing Guide - Apr 12, 2013 - A very good tutorial if you're new to Twitter

Infographics

1. 7 Tips To Get More Followers On Twitter [INFOGRAPHIC] - Apr 23, 2013