Today I found this site:<a title="findpeopleonplus.com" href="https://www.findpeopleonplus.com/" rel="nofollow" target="_blank"> https://www.findpeopleonplus.com/</a> where you can find user of Google+, not all of them but some and statistics.
 I don’t really know how it works but what I like the most are the statistics we have as filters on the same site. It shows what Google+ is until now a Geek Network <img src="/images/smile.gif" alt=":-)"> and other curiosites, like we are mainly men using it and apart for dating a relationship we are mainly interested in networking.
 Gender
 <ul style="list-style: circle;">
 <li>Male (698,703)</li>
 <li>Female (234,504)</li>
 <li>Other (9,404)</li>
 </ul>
 Looking For
 <ul style="list-style: circle;">
 <li>Networking (33,080)</li>
 <li>Friends (32,632)</li>
 <li>Dating (8,755)</li>
 <li>A relationship (8,743)</li>
 </ul>
 Occupation
 <ul style="list-style: circle;">
 <li>Engineer (28,886)</li>
 <li>Developer (15,962)</li>
 <li>Designer (12,669)</li>
 <li>Software Engineer (11,818)</li>
 <li>Writer (5,734)</li>
 <li>Web Developer (4,972)</li>
 <li>Software Developer (4,317)</li>
 <li>Programmer (4,095)</li>
 <li>Photographer (3,586)</li>
 <li>Artist (3,276)</li>
 <li>Architect (2,728)</li>
 <li>Teacher (2,470)</li>
 <li>Scientist (1,603)</li>
 <li>Professor (1,528)</li>
 <li>Musician (1,511)</li>
 <li>Project Manager (1,500)</li>
 <li>Actor (978)</li>
 <li>Coach (659)</li>
 <li>Librarian (637)</li>
 <li>Doctor (565)</li>
 </ul>
 On Twitter
 <ul style="list-style: circle;">
 <li>no (799,555)</li>
 <li>yes (148,441)</li>
 </ul>
 On Facebook
 <ul style="list-style: circle;">
 <li>no (842,830)</li>
 <li>yes (105,166)</li>
 </ul>

Some Google+ users statistics