After being exempted from Google search engine results for four years, tweets are finally back. The search engine giant has announced last Tuesday that people will start seeing tweets on mobile searches once again.

"Whether you're interested in the latest from Taylor Swift, news about the #MadMenFinale, or updates on the NBA playoffs, you'll have access to it directly from Google. Let's use NASA as an example-just ask the Google app about "NASA Twitter," and in the search results, you'll see Tweets from @NASA," Google posted on its official blog.

At the moment, tweets can be searched via Google app on iOS and Android, as well as mobile browsers. However, it is yet to be rolled out to desktops. The new feature is only available in English, but Google said they will be making it available to more languages soon.

While many netizens are quite happy with the reunion, some are also asking why the two companies have arrived at an agreement after four years. The answer? They have finally realized they need each other.

Twitter, just like any other website on the Internet, needs Google to drive more traffic. What this means is more companies would want to place their ads on the social networking site.

"We've got the opportunity now to drive a lot of attention to and aggregate eyeballs, if you will, to these logged out experiences, topics and events that we plan on delivering on the front page of Twitter. And that's one of the reasons this makes a lot more sense for us now," Twitter CEO Dick Costolo said earlier this year.

Costolo was referring to the number of people who found their way back to Twitter last year after having "logged out" for some time. These people were led to the social media site by Google.

But what's in it for Google?

"The goal of Google search is to have all the information someone might search for. Tweets are filled with great and often timely content. The tweets themselves should help Google's search results be more relevant to its users. Data associated with the tweets might also help Google spot and better surface important content outside of Twitter," Marketing Land explained.