Twitter has slammed changes made by Google designed to make searches more personalised as “bad”.

Google introduced the features, which it has dubbed Search plus Your World, this week. The new features include the addition of Google+ pages, profiles and posts in search results and are designed to make web searches more personalised. However, the micro-blogging service said it was “concerned that as a result of Google’s changes, finding this information will be much harder for everyone”.

“We think that’s bad for people, publishers, news organisations and Twitter users.”

The micro-blogging service said that for years, web users have relied on Google to deliver the most relevant results  when they were searching for something on the net.

 “Twitter has emerged as a vital source of this real-time information, with more than 100 million users sending 250 million Tweets every day on virtually every topic,” Twitter added.

“As we’ve seen time and time again, news breaks first on Twitter; as a result, Twitter accounts and Tweets are often the most relevant results.

Google used its own Google+ page to reveal it was “surprised by Twitter's comments about Search plus Your World, because they chose not to renew their agreement with us last summer”.

The search engine is currently facing antitrust investigation by both the European Commission and the US Federal Trades Commission (TFTC) in to whether Google's search results steer web users to the firms service rather that those from rival companies.

According to Reuters, a Twitter spokesperson declined to answer when questioned whether the micro-blogging site might approach antitrust regulators about Google's changes.