If you're not convinced yet, freelance Content Marketer and blogger Mike Farmer has some interesting points for you.
One thing I would add to his post is the importance of creating a Content Curation hub to really capture the benefits of your Content Curation efforts. Sharing links is just not going to be enough: in a world where tweets have a very short lifetime, you need to give your curated content a second chance by putting it on a curation layer where it can be discovered from search and from people with similar interests.
This can be a blog, a site or a Scoop.it page but if you're going to make content curation part of your content marketing strategy, you will need that long term repository that social networks don't bring.
Via Guillaume Decugis, antonios bouris, Gust MEES