Like many other free blogging platform available like Blogger, WordPress.com, TypePad, and Weebly, they certainly will set limitation of their services.
Since I am a Blogger user, I will talk about blog limitation on Blogger.
Actually, first thing came across my mind is, How Many Blog can I have in Blogger?. Some of internet user created their blog account for some various reason. It can be for personal blog, just for fun, even to make some money from affiliate program and advertising program like Adsense. For me, I have multiple various reason creating an account for Blogger. For example like my site here purposely to put a notes on my journey of exploring internet and IT knowledge.
Well, the answer of my first thought is in Blogger you may have up to 100 blogs per account. Pretty much right? And there is no limit of storage size per account in Blogger. Actually, Blogger "limits" here aren’t really very limiting. Below are the important “limits” as in Blogger support page. You can read it below or simply go to their original page here.
Number of Blogs: You can have up to 100 blogs per account.
Number of Posts: There is no limit on the number of posts you can have on one blog. They will all be saved on your account (unless you manually delete them) regardless of whether you are publishing archives or not.
Size of Posts: Individual posts do not have a specific size limit, but very large posts may run you up against the page size limit. (See the next item.)
Size of Pages: Individual pages (the main page of your blog, or your archive pages) are limited to 1 MB in size. This will allow for a few hundred pages of text, but it may be a problem if you are listing hundreds of posts on the front page of your blog. If you hit this limit, you will see an error message saying "006 Please contact Blogger Support." You can get around this error by lowering the number of posts on your main page, which will have the added benefit of making your page load faster as well.
Number of Comments: A post can have any number of comments. As with archived posts, if you choose to hide comments on your blog, all pre-existing comments will remain saved on your account.
Number of Pictures: Up to 1 GB of total storage, shared with Picasa Web
Size of Pictures: If you are posting pictures through Blogger Mobile there is a limit of 250K per picture.
Team Members: There is a limit of 100 members per blog.
Number of Labels: Up to 2000 unique labels per blog and 20 per post.
Blog Description: Limited to 500 characters, with no HTML. Adding additional characters or HTML may cause it to revert to a previous setting.
"About Me" Profile Information: Maximum of 1,200 characters.
Profile Interests and Favorites: Maximum of 2,000 characters in each field.