urban # us
urban # us

Solution

urban # us..   urban , trending ,connecting people 

The symbol also references the city map cross lines
The green color is for sustainability. 
Option 1: 
a) U form
b) A building in perspective
c) the hashtag cuts the u form/ building
d) urban landscape in map form/ hastag reference
e) vibrant colors
f) urban # us works as wordmark also

hashtag 
http://en.wikipedia.org/wiki/Hashtag
Font : Neuropole & Consolas

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