Nope my experience is that the general reaction from these sites to DMCA takedown requests is take it down right away as they do not want to be held responsible...
Afterwards they let you sort it out afterwards with the 'content owner'
Looking at their point of view, I suppose they get tons of DCMA requests so probably not feasible to start discussing with the people posting and mediate...
That is my experience, as stated dmca is taken very seriously and social media sites act immediately as they do not want to be sued...will they takedown immediately as they get notice? I am trying to understand the process at different social media sites.