Wether or not it really helps with sales depends on how many followers you have, and who is following you. I'd recommend making a Twitter page because it definitely won't hurt.
I only have about a dozen twitter followers, but some are important in marketing such as a Japanese site, they helped me get thousands of downloads in Japan, so even if you only have a couple of followers, they could really help.
use http://www.innovatty.com/twitter/IDRTG/index.php?page=home, it helps indie developers get their messages out through retweets, it really works, i've gotten tweets to 20000 people through this method, and i only have like 460 followers
Twitter helps much more than Facebook does, IMO. My previous twitter account had around 2000 followers. I had a reach of almost 10k due to retweets and such. Before having a twitter, my sales were not even half of what they were afterwards.
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I'd recommend making a Twitter page because it definitely won't hurt.
I only have about a dozen twitter followers, but some are important in marketing such as a Japanese site, they helped me get thousands of downloads in Japan, so even if you only have a couple of followers, they could really help.
But it all comes down to Quantity!
https://twitter.com/#!/ozboybrian
Follow me :P