I've noticed that Blogger appears to be letting spam comments through, so please be careful if you see a comment on a thread, which bears no relation to the conversation.
Here's an example:
"Broadband Sue has left a new comment on your post
Here’s a Broadband Video that will show you how to check availability by postcode, how perform a broadband speed test and where to find broadband forums to answer your questions. There are also offers for PlusNet Broadband."
Ed:In this case it looks quite possibly as if it's an attempt to re-direct the wary to a video site that will download malicious code into your PC, possibly for identity theft or to hijack it as a new member of an organised crime "zombie" network.
Unless a link if from me or you recognise the author in regard to the thread, please don't be duped into following such links here or indeed on any weblog.