This site is a source of spam and hosts links that point to known scam operations (linkedin.com/pulse/inteligen-best-brain-nootropic-another-scam-viewers-facts).
Apparently they, unknown to my friend, accessed his address book and copied my address and took it upon themselves to spam me. This is clearly unsolicited spamming.
This site continually sends spam even after I have reported their spam and I have never opted in to receive anything from these people. Another friend of mine gets nothing but scammers attempting to make a connection with her so as to get money out of her.
Illegal and untrustworthy.
I knew about this site for a long time, but recently I studied it from the inside and was pleasantly surprised by its usefulness and effectiveness. I really like it, I use it and there are no objections.