I don't get ppl who announce that they're blocking you.
It's like, who cares? Don't want to see someone's timeline, no problem, just block & move on.
It reminds me of the Aesop's fable about the gnat & the bull: a gnat alighted on the horn of a bull & stayed for a time. Before flying away, the gnat said to the bull, "I'm leaving now; I hope I've been no burden to you while I rest."
The bull replied: "Do as you will; I didn't notice when you landed, & will not notice when you fly away."
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The moral of the story is: don't be an asshole.
Actually I think the moral of just about every Aesop's fable can be summed up as "don't be an asshole"... in this case it is, of course, a lesson about self-importance.