If you add value to the conversation people will follow you. My formula for tweeting is 33% conversational, 33% check out my blog or images from my latest photo shoot (adding value), 33% answering or asking questions and 1% random thoughts.

Great post - with #6 I try not to criticize anyone on Twitter. (It's a waste of time to pick fights etc.) I may challenge people's thoughts but I try to do so in a respectful mature way. ("If you argue with an idiot, no one from afar can tell the difference.")

I get too many tweets saying: "Leaving for the coffee house." or "This cake is awsum" or other irrelevant tweets.

Thanks again.

Considering the minimum number of followers is an excellent question! First looking at your Twitter followers numbers can give a skewed impression of your marketing potential, since the numbers may be inflated by spammers and 'irrelevent' followers. It is important to properly vet and review your followers, which is a hard process and slows the numbers growth, but ultimately makes your subscriber base more valuable. Generally the more material from other relevant sources that you retweet, you are on the road to building a solid base for tweeting your own updates and information about yourself. For Twitter strategies the process doesn't end when a target follower amount has been reached. It has been said that for your Twitter marketing, there's kind of a 9-to-1 rule - you need to be marketing other people nine times more than marketing yourself. This is what builds trust and relationships

There are LOTS of Twitter appications for managmeing your Tweets; try a few and see what fits with your way of working. Do some searching to see who to follow (MrTweet.com, bingTweets.com , etc.)

Use lists. Hook into other photographer's lists.

Check out su.pr

Duane / DRS Photography
Twitter: @drsPIX