Google has taken away the previous search operators very gently “the + search operator. So it probably means that now if you try to add a + sign in your query, google will not accept it even it will be ingnored.
Explaining the reason behind the removable of the search operators, Kelly from google explained in a forum thread and said that now you can use the quotation marks operator at the place of + operator and adding some more points she said:
We’ve made the ways you can tell Google exactly what you want more consistent by expanding the functionality of the quotation marks operator. In addition to using this operator to search for an exact phrase, you can now add quotation marks around a single word to tell Google to match that word precisely. So, if in the past you would have searched for [magazine +latina], you should now search for [magazine "latina"]
The reasons seem quite transparent. Google removed the + operator because of their social network “Google Plus”. They don’t want Google+ to be confused with the operator.
A post script from Danny Sullivan exposes: I can’t believe Google has done this. I use the + command all the time, especially in an age when more and more, Google constantly reshapes a search based on what it guesses a searcher wants, rather than what they entered.
The functionality is still there, which is a relief, but having to do a search like this:
Mars +landings +failures
now like this:
mars “landings” “failures”
is more complicated. It also goes against 15 years of how search engines have operated, where quotes are used to find exact phrases. Now all those references across the web have become outdated, for no apparent reason other than maybe Google picked a name for its social network that wasn’t searchable.
As for “+1″ itself, you literally cannot search for that on Google.
Look at this: