Corinne Hui Yun Tan has self-archived "Terms of Service on Social Media Sites".
Here's an excerpt:
This article considers the provisions within the terms of service ('TOS') of the social media behemoths of today—Facebook, YouTube, Twitter and the Wikimedia Foundation. In particular, it examines the main provisions that purport to regulate, from a copyright perspective, generative activities on social media sites. This empirical work is undertaken so that the article can shed light on the relationship between the contractual and copyright regimes. To do so, the article identifies the instances where the contractual regime is to some extent aligned with the copyright regime, and further, where there are potential incompatibilities between the two regimes.