One of the reasons I like LiveJournal is that they've never used that type of spam as far as I know. I regularly get it from other blogging sites, and would never join them.
For an in-depth look at the problems with Google+ see this article
http://www.antipope.org/charlie/blog-static/2011/08/why-im-not-on-google-plus.html and the article it links to.