Social sites

Now, social services are gradually moving from comprehensive to more thematic.

For example - classmates, and ilovecinema.

Vertical - means
Horizontal - Theme
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However, the lack of thematic lies in their limited vertical.
For example, ilovecinema can only write reviews and blog. At the same time, people who are interested in cinema, and they want to discuss books about the cinema, videos, etc.

Closest to this is the social network platform model (facebook), which allows multi-format, as many developers create services for users.