Some more things:
All the WP personal domain sites are extremely slow to open both on my computer and my husband's computer. Other sites are opening normally.
My husband is a WP member, but doesn't have a blog. He went to rich-full-life on his computer and couldn't "like" either. Even though he was logged in he was asked to log in again and even after doing so it had no effect.
And the same as with me he was asked to log in again when he tried to comment even though he was already logged in. The comment didn't appear. Yet. I have noticed that the comments arrive some minutes, or hours after they've been made.
I hope all this information is helpful. Since my husband is having the same problems, with his computer, I suspect the problem must be systemic, not just with my blog. But it also seems to be erratic. Many people do seem to be able to like and comment without problems.
All I know is that I've had these problems for about 4 or 5 days now, and that they've never happened before, and it only applies to WP personal-domain, and non WP sites.
aapatawaran, rich-full-life, and s3city are just examples.
Thanks once again.