They actually didn't specify to do their proof of work/ update in that kind of way.
★★★★ Proof of Work ★★★★
➽ Comment your proof of work in the following format: Week #1
Facebook Campaign
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The way I see it is campaign participants thinks that this is a much easier approach rather than inserting the hyperlinks of their previous weeks to their latest post which I think is a much more less spammy looking compared to what they are doing now.