SponsoredTweets is very reliable. Magpie is a good one too and I recently heard about http://www.twivert.com too
MyLikes is the best from all and if you are a U.S. citizen is even better. Anyway you can make money with Twitter but you have to search carefully not to be scammed from buying software.
Quite much. Well, from $0 to even more than $100/ day depending on what monetizing strategies you put in place.
I tried sponsoredtweets. But didn't get any offer till now from sponsoredtweets, even though I have 900 followers in twitter. Now I will try twivert. Thanks for sharing the source.