Social search company Topsy has added Google+ to its index. The integration will allow you to search through public content on Google+ in real-time, with the results being ranked by their level of influence.

Topsy’s dedicated search engine lets you search influence-ranked
real-time and historical public posts on Google+. You’ll be able to find the most relevant, noise-free Google+ public posts on any subject without having to log in to the social network.

Topsy identifies who it believes to be the experts for specific keywords, terms and links using its algorithm. It updates its influence graphs almost in real-time based on the attention generated from Google+ and Twitter.

Vipul Ved Prakash, co-founder and CEO of Topsy, said:

We are proud to be the first search engine to provide comprehensive search over public Google+ posts. Beyond the 220 million daily tweets we are currently indexing, with the addition of Google+, we’ve extended our search technology to deeply index and rank long-form social conversations. On Topsy, people can now search Google+ and Twitter for realtime, relevance-ranked results, and businesses can be better informed about what¹s important by using our APIs to mine the collective intelligence of posters on both Twitter and Google+.

The search engine displays popular content from Google+ on its home page. You can sort by relevance or date, but you cannot filter the results based on People, Google+ posts or Sparks, which you can do through the native search feature on Google+. The launch of Topsy’s Google+ search engine follows on from the release of the Google+ API, which now lets developers access comments, +1s and search, as well as Hangouts.

Topsy closed a $15 million funding round in March, with participation from Ignition Partners and Founders Fund, among others. The company launched a real-time social search engine for videos in the same month.

You can check out Topsy’s real-time social search by visiting plus.topsy.com.