Hey Roshni,
When are you anticipating the blog post? I see it's not up yet.
We need to tweak the tweet a bit because of the link (to the blog post) which makes it about 10 characters too long. One suggestion off the top of my head:
One year after the Snowden revelations, the world is fighting back against unjustified surveillance. #stopspying <link>
We can also post on facebook and G+ (and usually do) we can do that with the text you proposed above (less care about characters obviously) or expand on it a little bit (not too much) with something we say in the post.