A recent Facebook post has been trending around (the post has been taken down) about a group of people starting mass murder and school shootings, the recent post included a string of random letters that might be a code (I'm not sure), the school I'm in is already enforcing security because of this, (censored text are names of schools)

String of text: Li4tIC4uLS0tIC4gLS0uIC4tIC4uLS0tIC4uLS4gLS0tLS0gLS4uIC4tLSAuLi4uLiAuLi4uIC4gLi0tIC4uLS4gLi4tIC4tLi4gLS4tLiAtLi4uIC0tLSAuLSAuLS0gLi4uLi4gLS4tIC4tIC4uLiAtLi4uIC4uLSAtLi0tIC4tLSAuLS0tLSAuLi4uIC0uLi4gLi4gLS4uLiAtLS0tLSAtLi0tIC4tLSAtLi4tIC4uLi4gLS0uLiAuLi0tLSAuIC0tLiAtLi0tIC0tIC4uLS4gLi4tIC0uLiAtLS4gLiAtLS4gLS4tLiAuLi0tLSAtLi0gLS0uIC4uLiAtLSAuLi4uIC4uLi0gLS4uLiAuLiAtLi4uIC0uIC0uLS0gLS4uLSAuLS0tIC4tLS0gLS4uLiAtLi0tIC4uLi4tIC0tLiAtIC0tIC4uLS4gLS4gLi0gLi4tLS0gLi4tLiAtLi0tIC0uLi4gLi4tLS0gLS0tLS4gLi4tIC4uIC4uLi4gLS4gLi0tLiAuIC4tLSAuIC0tLiAtLi4uIC0tIC0uLS4gLS0uIC4uLiAuLi0tLSAuLi0uIC0tLSAuLSAuLS0gLS4uLSAuLi4uIC4tLi4gLi0tIC4uLi4gLi0tLiAtLi4uIC0tLiAuLi0uIC4tLiAtLi0tIC0tIC0tLS0uIC0tLS0tIC4uIC0tLiAuLi4uLiAuLi4uIC4uIC4gLS0tLS4gLS0uLSAuLi0gLS0tLS0gLi4uLSAtLi4gLi4gLS0uIC4uLS4gLS0tLS0gLi4gLS0uIC4uLi4uIC4uLi4gLS0uLiAtLi0tIC4tLS0tIC4tLS4gLS4uIC4uLS0tIC4uLS4gLi4tIC4uIC0tLiAuLi4uLiAtLiAuLiAtLS4gLi4uLiAuLS0uIC0uLi4gLS0gLi0uIC4tLS4gLi4gLS0uIC0gLi4uLiAtLi0uIC0tLiAuLi0uIC4uLSAuLSAuLi4gLi0tLS0gLi0tIC0uLS0gLi0tIC4uLi4uIC4tLS4gLS4uIC4uLS0tIC4uLS4gLi4uIC0uLS0gLi4uIC0uLi4gLi4tIC0uLS0gLi4uIC0uLi4gLSAtLS4uIC4uLS0tIC4gLS0uIC0uLS0gLS0gLi4tLiAuLS4gLS4tLSAtLi4tIC0tIC0tLiAtIC0tIC4uLS4gLS4gLS4uIC4tLSAtLi4tIC4uLi4gLS4uIC0uLS4gLS4uLiAuLi0gLS4tLSAuLi4gLS4uLiAtLS0gLi0gLi0tIC4uLi4uIC0uLSAuLSAuLi4gLS4uLiAuLS0gLS4tLSAuLi4gLS4uLiAtLi0tIC4tIC4tLSAuLi4uLSAtLS4gLS4tLiAuLi0tLSAuLS4uIC4uLi4uIC0uLS0gLi4uIC0uLi4gLi4tIC0uLS0gLS4uLSAuLS4gLi4uLiAtLS4uIC4uLi0tIC0uLi4gLi0tLS0gLS4tLSAuLS0gLi4uLi0gLS0uIC0uLi4gLS0gLS4tLiAtLS4gLi4tIC4gLi4uLi0gLS0uIC0tLi0gLi0tIC4uLi4uIC0tLS0tIC4tIC4uLiAtLi4uIC0uLiAuIC4tLSAuLS0tIC4tLi4gLS4tLiAuLiAtLi4uIC0uLiAtLi0uIC0tIC4tLi4gLSAtLS4uIC4uLiAtLi4uIC4tLS0gLS4uIC0tLiAtLS0uLiAtLS4gLS4tLSAtLi4tIC0uLSAtLS4gLS0uLiAtLS4gLi4tLiAtLS0gLi0gLi0tIC4tLSAtLS4gLS4tLiAuLi0tLSAuLS4uIC4uLiAtLi0tIC4uLiAtLi4uIC4uLi4gLiAuLi4gLS4uLiAtIC0tLi4gLi4tLS0gLiAtLS4gLS4uLiAuLS0gLi4tLiAuLi0gLS0uLiAuLi0tLSAuLS0tLSAuLi4uIC0uLi4gLS0gLS4tLiAtLi4uLQ==

Need help, might be serious