No, i did not read it at all. If you just want to participate in a signature campaign or social media campaign it seems like reading a whitepaper is not necessary. I just see how many participate and who the manager is. If you want to invest in an ICO project, it would be better if you read whitepaper.
I always read white paper when I take part in the bounty, even if I'm just a twitter bounty. If I take part in a company bounty, then I'm also an investor, I invest my time and energy in them. And it is important for me to know for what I will spend my time.
Especially in the technical documentation you can find information about the distribution of coins/tokens and their cost, so you can find out how much I will get at the end of the company.