Is someone blocking me on Twitter or is it a Twitter glitch?

How do I know if I've been blocked on Twitter, or if Twitter is just glitching and I'm not getting some updates?

I follow about 300 people (and almost the same # follow me), but I recently noticed there are some whose Twitter updates I'm not getting or that I'm getting only sporadically. One is a person who follows me & I never get her tweets; two are people I followed but who don't follow me -- and I've never tweeted them directly, so I don't *think* I've annoyed them. Three are people whose tweets I get only sporadically.
 
sad I’m confused
Inappropriate?
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