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Thank you for the reply, i thought it would not matter, but its worth checking.

I use twitter to advertise my shopping site by automatically tweeting every hour or so random discount codes and offers from my database. I generally vary the tweets to include my url address rather than shortening it to advertise my business. I generally get 10 to 20 hits a day, they generally convert to sales once or twice a week. I used to add the discount code but because twitter is high profile and monitored by the merchants and if there are any errors in the tweets the merchants tend to act on it. Also there are loads of sites scraping twitter and gathering discount codes and offers to offer on their sites, converting the tweets and monetising to their own affiliate links.

Twitter is becoming very spammy and some sites are tweeting very few minutes their offerings. You may want to look at twithawk where you can retweet you targeted audience, but be careful as your may reported as spam.

Does it matter if i use to www or no www for SERPS on google? Obviously the redirection would be set up for either in the htaccess file.