Hi Jannik,
I am sorry for the delay of this reply.
Regarding your issue, it seems like the issue was caused by two module from JReview, the 'JReviews Listings Module' and 'JReviews Reviews Module'. I've temporary disabled these two modules and now it seem like EasySocial is working correctly.
What happened is, when JReview module rendering the items, the module fire an ajax request for each item, and each ajax request returning the full html structure of the same page which caused the page to crashed ( sometime ) or causing javascript error to EasySocial
I not sure why the ajax request is returning the whole page html structure and maybe you should seek further assistance from JReview.
Hope this help and have a nice day