339Social Networking in the Cloud
with different names. For example, a user from Los Angeles can refer to the name of the city as LA,
L.A., or City of Los Angeles, etc. Users may also refer to different locations with the same name.
For example, a user from New York can refer to 6th Street as a street name in New York, whereas a
user from Austin may refer to the street with the same name in Austin. These examples can dilute
the spatial distribution of the terms.
The tweets do not always contain location-specic terms. They may contain many general words
from a natural language, as users tweet about general topics. Hence, the content of the tweets are
considered noisy.
A tweet can have terms referencing to multiple locations. This reduces the ...