Site rating services could gradually become a problem for "amateur" bloggers and other webmasters, because one's site can get downgraded by linking to other sites that someone has downgraded.
Update: It's not over for today. Now, Chrome and IE are warning on some security certificates from Twitter links, even without https. Chrome talks about a domain name mismatch (like the 2008 "big problem" that caused a conference at Microsoft). Maybe everybody is getting stricter. In one case, the Tweeter does everything on MacIntosh (I know the person) and may not even be getting the error.
Second update: Webroot scan found (and quarantined) an unusually large number of spy cookies, but no viruses. I have not heard of a lot of the cookies. It may well be that Webroot has tightened its standards for what it considers acceptable cookie behavior. Probably the spam email in my in-basket will go down.