LinkedIn, blogs - not exactly reliable sources of information given they are what you are saying about yourself. We've had candidates list the number of Instagram likes they had as if it proved anything. Sold some t-shirts on Cafepress, wow you must be an incredible developer / entrepreneur then
I have seen some amazing code in a Github repository that the candidate couldn't explain to me. I suspect it was a joint project that someone else was a major contributor to
So yes I will want to verify / test your abilities
But personally I read a CV and then talk to the candidate. Worked well so far