Hashtag, @, and Twitter - Can Some Explain How They Work

Okay, I'll admit to being old. I think I've fairly tech savy, but I don't get these.

I went to an advance screening of "The Way, Way Back" and the moderator asked that we hashtag (#) the movie. I didn't know what he was talking about so I Googled it and it said something about allowing people to see your comments if they are following it?

Also, my neice has put up on Facebook that she's at a friend's in Long Island and then #something, @someone. What does the @ mean?

From what I gather, you can "follow" someone on Twitter by subscribing to their "Tweets". But do they come to you as e-mails, texts or something else. Do I really want to know in real time that somebody is doing something?

I think it is just two hash browns playing tag.



That is hashtag isn't it?

#liveandlove
@everyone

On facebook:
If you click the hashtag #liveandlove it will take you to other posts that have that same hashtag in the post.

If your name was "everyone" you would be alerted to know your name is being talked about. Or someone is alerting you because they want you to read something.

This is a funny pic!