IDRTG stands for Indie Developers Re-Tweet Group. It was established in February 2011 by @innovatty to give indie developers more exposure on twitter for the purpose of promoting their apps. It is one of the most effective free marketing techniques on Twitter. It is now the largest retweet group for Indie developers and new members are joining every day. IDRTG is a community where developers retweet and support each other. A single tweet by a member with few followers can be retweeted multiple times to reach thousands.
IDRTG – The Most Effective Marketing Technique on Twitter