Is it allowed to aggregate social media data?

We are a group of data scientists, trying to build a social media search engine that basically focuses on trends and follows the method of store->index->rank method of storing social data from Twitter, Instagram, Vine, Tumblr (for now; we plan to add more in the future).
We have researched Terms of Use of major social networks, and we haven't found anything substantial that it is unlawful to aggregate social media data.
So, does someone know or experienced such a use case before that we should be wary of?

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