Tweetminster has given users the ability to search back through MP's conversations on Twitter.
Voters can now search through all historical posts made by MPs, political parties, candidates and government on Twitter.
The site aims to promote better communication between parliament and voters and increase accountability.
Currently only 18 British MPs use Twitter, but the service enables voters to email their MP and invite them to join.
Alberto Nardelli, Co-founder of TweetMinster said: "We're really excited by to be launching search on Tweetminster, as it will allow people to easily find any comment that a Member of Parliament made on an issue that they're interested in, which ultimately makes politics more open, transparent and accountable."