"When the new changes were announced, along with the censor added to certain terms on the interest page, people considered the option to do a Content strike, because LJ is content driven. The details have been decided, and so the most possible people can know about it, everyone is posting it in their own journals and communities. "

This is the Info about the Strike, posted in beckyzoole's journal:

The one-day content strike is on for this Friday, March 21, from midnight GMT to midnight GMT.

For 24 hours, we will not post or comment to LJ. Not in our own journals, not in communities. Not publicly, privately, or under friends-lock.

This is a protest that will have long-lasting effects, showing up forever in the daily posting statistics.

This is a protest that will not harm LJ in the long run, as leaving LJ might do.

This is a protest that will demonstrate the power of community, as all users unite to support Basic users and the concept of adfree space.

This is a protest that will educate the new owners that LJ is driven by user-created content.

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The rest of the info is in this link.
The reasons, well explained are here.
And last, the time for the different time-zones is here.

Any questions or such, make them in the first link!

Kindly taken from kanae_mizuhito's journal.