Yes. This is what is usually means.
The location on twitter is usually the place where the page's holder lives.
This is the location the tweet was posted from.
I'm assuming you mean Twitter, because a twitcam is a live broadcast via Twitter, so his Twitter is @NiallOfficial :) Hope this helps!
ÜT stands for the Über Twitter Client. The numbers after it stand for the person's GPS coordinates for their location (latitude and longitude).
The Twitter headquarters are located in San Francisco.
If by local, you mean, how do you get Twitter to show your location. You must be using Google Chrome, and enable geolocation via Google Gears. There are a few mobile apps that support it as well. At the moment Twitter's geolocation features are very limited.
In this case, it's not a hashtag. It's actually a number sign. Twitter now displays the Google PageRank for each Twitter profile page. It should not be confused with a Twitter ranking -- people with lower follower counts can have better PageRank.
Tosho is a user on Twitter.
The Twitter headquarters are located in San Francisco.
Find their Twitter username and begin your tweet with it.
RTMI officially on twitter means ReTweetMyIsh
Exact numbers are difficult to determine especially as not everyone uses their location on Twitter.