Re: Excellent tips
I'm wondering the same thing. I think I prefer having endorsements from people who actually know me and are genuinely emdorsing me because they believe I have the particular skill in question. When people who don't know me endorse me for some skill that they obviously have no direct experience of (one way or the other), I generally don't accept their endorsement. If it is for some skill like editing or marketing, that they can have formed an opinion from what I have presented publicly, then it is in a gray area for me.
As for my endorsement of others -- I only do this for people I actually know and for skills where I have first hand knowledge of that person performance. I believe that one should be very judicious in endorsing people otherwise it devalues all endorsements. I am very glad that LinkedIn provides the tools each individual to control their endorsements as they see fit.