If you ever go into your STATS button and see Traffic Sources, you will see a lot of Google sources, cool and good and for you. The ones that are not Google--do not click on them. They may have goofy names, sound like awesome sites that are sending you traffic, have weird numbers and names. DO NOT CLICK ON THEM. I know you are curious why that channel is bringing you traffic, but once you go onto their site, they can now link their site with yours. Many of these are Russian and overseas sites and they will do things like take your blog's name and use it, use your blog list, use your posts and your images.
PROTECT YOURSELF - BLOGGER WILL NOT. They allowed these referral sites a backdoor.