I have developed a twitter application previously. it could follow based on keywords and unfollow and you could build a campaign towards that. it had many many features.
Relevant Skills and Experience
c#,.net,desktop application software is what i will use for this. this was what my previous project was based on.
Proposed Milestones
$500 USD - full milestone released once work is done
Additional Services Offered
$50 USD - more features as per request once application is complete.