On Facebook, who blocked me from sending friend requests?

[Khoi Minh Vu]

At this moment, I have been temporarily blocked from sending friend requests, even anyone I know them on Facebook, which this block lasts for 30 days. And I am also blocked from messaging people who aren't in my friends list on Facebook, equivalent to adding friends. But in this instant, I didn't ever send texts or add friends to strangers or people I don't know on Facebook.

So as well, in this instant, why am I also blocked from messaging people who are not my friends on Facebook?

But if next time, I continue to get blocked from adding friends or messaging people who are not in my friends list on Facebook, will the block last longer than 30 days? Or will it be shorter than 30 days?
By now I am really trying to know who blocked me on facebook.