I got an e-mail with a link which claimed to give me a Google plus invite. It was a shortened URL and with a little bit of suspicion I open the link to find it leading to an online pharmacy website.
Another e-mail had a link which was labelled by Google as a banned website or an attack website. The sad thing is that these online pharmacy websites (or I should call them crappy web pages) had a good Alexa ranking and even a Google +1 button in them.