Many of the blogs I follow have giveaways. To be honest, I've entered a few but usually do not. They usually want you to make a comment. Two, if you are also a follower. Then they want to be liked on their FB and the sponsor's. And often some other things. I read the blogs because I enjoy their content. When I see the day's post is a giveaway I usually just move on. It is interesting to see that a normal day's comments may number 10 or 20 but when there is a giveaway it rises to astronomical numbers - in the hundreds and sometimes over a thousand.