Weebly is a good website builder. However, the individual sites at Weebly are owned by separate webmasters, so I can't vouch for their contents. In other words, Weebly itself is good, other sites hosted by Weebly, I don't know.
Unfortunately weebly.com is now home to the many spammers that afflict the web. I find dozens of posts with spam links on forums and blogs leading to sites which are sub-domains of weebly.
Most of the other free hosts have cleaned up there act and have removed these sites. Weebly need to do the same.