Thanks for pointing out. Actually I don't Post my post using "Create a Collection" instead of this I clicked on an option in the advanced settings of any post, showing a new feature as "Use a Collection" I just enabled it and nothing more. But I genuinely don't get that how this whole new feature works. If there's is any post regarding the use of #c-c-c tag thenw it would be beneficial for me for knowing about this feature in much more detail. And please don't downvote my post. I don't does a very big mistake. I agree I had a mistake but it's a silly mistake done because of lackness of technical knowledge about the new feature that PeakD had just added 2 days ago. I request to remove downvote from my post and promise to know more about this new feature. And will don't do this same mistake again in future. And if you know any article which can explain about this mew feature in layman terms then please send it to me. Thanks @peakd!