We have a number of blog owners, apparently located in Canada, who have been sharing their "blogspot.com" published Blogger blogs, using the "blogspot.ca" alias. This week, two major services - FaceBook and McAfee Anti-Malware, have decided that links mentioning "blogspot.ca" are not trustworthy.
Use of the Country Code aliases - of which "blogspot.ca" is simply one of many - has provided potential for confusion, for some time. What some blog owners may not realise is that only the online viewers of the blog (and the owners, viewing their own blogs) see the "blogspot.ca" alias - and only when they are located in Canada. At the same time, people in Malaysia see their blog (and other blogs, published to "blogspot.com") as "blogspot.my", people in Mexico see their blog as "blogspot.mx", etc.
Thanks to the use of the canonical URL, specified in the blog header, the search engines index "blogspot.com" published Blogger blogs, consistently, as "blogspot.com".
It's possible that FaceBook and McAfee have tightened down on their link validation criteria. Noting that the "blogspot.ca" alias is not indexed by the search engines, they may simply be objecting to people posting links that have no reputation. Multiple people posting links without reputation could be seen as an organised link spamming campaign - and FaceBook has reacted.
Why FaceBook (social networking), and McAfee (anti-malware), seem to have changed their criteria simultaneously, remains to be seen.
For immediate concern, we see many Canadian blog owners with massive amounts of previously posted FaceBook links, pointing to "blogspot.ca". Unfortunately, this may be an issue which the blog owners need to discuss with FaceBook.