I tried several times to run a LinkedIn page, and never succeeded. The main reasons are I don't have the money to throw at publicity programmes, and plans, and I am a blogger, not a hardcore publicity junkie. The last time, last October, I spent more time trying to verify myself to the site, than doing anytihng on the site, and despite having to be verified one person still tried to scam me.
The easy way to detect the scam is a publisher will give you an advance on what they think the book will earn, whereas a scammer will say pay me, and I will promote your book, I was so desperate to be recognised as a writer, this year I let myself be a scam victim, That is the the only thing I never told my late wife.