M.L.
# is used for
1. emphasis, such as #storyofmylife
"Migraine, car broke down, screaming kids, now my inlaws want to host dinner... #storyofmylife "
2. or, if an event or popular term is being circulated, then the # term is what people can click on to see all related posts. So, if everyone is talking about tebow, or justinbeiber4eva, or Christmas, it will have the hashtag # in front of the term describing that item so...
"I'm so tired of hearing the Baby it's Cold Outside over and over and over on the radio. Gotta love #Christmas "
3. If there is an event like a conference, it will be tagged with that conference's given tag, so like a red cross meeting where others can quickly find each other's twitter posts to respond to each other will read,
"Anyone have the minutes of the last coordinated blood drive schedule? #rdcnfr
When a hashtag shows up on facebook... it's usually someone who is copy and pasting their twitter status, having it automatically loaded when they post, or thinks everyone gets twitter speak. #lame Or some social media sights are using it now as searchable terms. Again #lame b/c they can't think of their own system?
(see what I did there? ;)