With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Instagram is desktop-based and it's very popular.
text_B: Purpurellus is a genus of sea snails , marine gastropod mollusks in the family Muricidae , the murex snails or rock snails .. Muricidae. Muricidae. genus. genus. marine. marine ( ocean ). gastropod. gastropod. family. family ( biology )
not_related.