auto-responder

Anyone know of a free reliable method to auto respond to keyword strings from users posts ? I used to use a Yahoo Pipes setup which used a Twitter generated RSS feed for a search term then creating an output RSS feed which fed into TwitterFeed with the auto responses. I'm sure those who have...

Hey guys, I was wondering if anyone had any idea how I could build a list of emails without using an auto-responder. I'm going to buy a subscription to Aweber once my traffic grows a bit more, but for now I would still like a way to collect a list from my already engaged users that I can...