I'd say if you're as unclear as it sounds as to how social media & internet marketing works, just stay away from Tumblr and similar venus - the ROI (and I'm including time/effort in this) is going to be near zero for you.
Also asking for specific profits or whatever like you're doing, you do realize it's like asking "How much does a restaurant make?", right? So many variables it's impossible to give even a reasonable range let alone an 'average' figure.
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DeltaofVenus.com - Vintage Erotica from the 1800s through 1979
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