What is spam blog?

What is spam blog? Do you know?Do you have any idea behind it?I was totally unaware of it.Yesterday blogger block my blog Free Money Maker due to spam blogging.I don't understand why and how happen this?What I have done,which treated as spamming.I don't think did anything.Then why my blog?There are several reason that you blog might be treated as spam blog.If you have random blog posting,schedule posting for different days,if anyone click on flag from your navbar.I have trying to restore my blog,blogger said that they will take 48 hours to review my blog whether it is spamming or not.See what happen in next 48 hours.Thanks.