Dumb question, what does hashtag mean ?

[ODBJBG]

No worries. #seewhatIdidthere

[Brazoo]

#notbad #irony

[Gorn Captain]

Imagine I just landed on the planet Earth from planet Stupid.

Captain Dork from the USS Stupid.
I like it!
In the first episode, he accidentally transports inside a bulkhead...

Reading about Twitter, I feel old and outdated, but in a good way.
All information these days is so condensed and packed together, I long for someone to send me an old-fashioned letter. When I want to say something, I prefer to elaborate and talk at length, and stuff like FB and Twitter just don't do that for me.
Pretty soon we'll all be talking in Caveman Language.
"Me want spareribs!"
"Like!!!"

[Monstar]

I work a lot with social media and publicity, so I am #this and #that all day long. As well, if you want to tag someone there is the '@' symbol preceding one's name/username.