This has puzzled me for years, in the crypto community having a LinkedIn profile seem to be the communities way of saying "Yep you're a legit person".
There are a lot more puzzling facts in the crypto communities than this.
It's not just LinkedIn but if you have a facebook account with some pictures you're also seen as a legit team member.
I've always warned people, it's not a matter of being known or having a social profile or even a company, just because behind the project it's a 5-year-old company a director who does youtube interviews and so on it doesn't mean $#%$.
Look at bitclub, bitconnect, butterflylabs, oncecoin, ohhh..I'm not going to list them all as I'll miss Mother's day with them...
Now to the second part
What do you just think and how do you guys verify someone is legit, say if you want to collaborate/invest in their project?
First, you need to look at the project from the other side of the fence.
It's not about how great it is on paper, but, do people really need it?
Do you need a special coin to start an uber clone, a renewable energy company, a travel company?
If all the company promises can be done just as easy without the token it means simply the ICO is a cash-grabbing scheme.
Once you're past this, ..oh you're out of ICO projects to invest in.