8 odd social networks that cover life's strange niches

Facebook, Snapchat and Instagram are great and all, but they can be broad.
For those who want more specific communities to cater to their odd tastes, a bunch of social networks exist that are designed to be more accessible to those who those who march to the beat of their own drum.
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And important note: not all of these are open yet, or still open in the case of some super-niche entries.
1. Discuss cars with the Top Gear s