youlikehits is great for google+ exchange, ive bought a few credits and its pretty decent, you can use bots too but its against the TOS
It's so quick to gget into people circles on Google plus – you just add a whole bunch of people to your circles and a lot of them add you back. For mass handling your circles Circloscope is really good. It's a Chrome extension http://www.circloscope.com/2013/04/google-plus-circle-management-tool.html Free to try, $5 if you buy it. Not really expensive Malc
addmefast is also the best way to get likes for facebook, followers for twitter and followers of Google+
Google+ has turned the tables on how search traffic worked. The great thing about this is that it provides a tremendous opportunity for those willing to work Google+ for additional search traffic. I recommend you to try SocialClerks.com, its the best social exchange site. Take a look, you would love it
I would not use any of the exchange services for G+....They are just too smart...I would use them for my other social accounts though