Finally registered successfully into the signature campaign after a day of hard time registering to the slack channel. Having an old version of browser makes it difficult to get into a slack channel. Glad I've updated it today.
Is it required to posts tweets and shares on facebook here in the forum?
Yes, if you want to participate in Atlanta Twitter and Facebook campaign every week you need to post your links in the same where you applied. I think this is one of best ICO which is developing decentralized technology in coming days.