I just do random things...

Like going outside, watching TV, reading a magazine/book/comic book, etc.

I usually start to get a little anxious.

First I'll open up my chat program and stare at the blank friends list before realizing I don't have any chat buddies any more.  I'll toy with the idea of joining a chat room before deciding I'd rather not deal with the spambots and sex-crazed lunatics.

Then I'll come here and realize that anyone that might want to chat with me is not online, and I'll further realize that I can't post a request to chat.

I'll move on to facebook and realize that all my 'friends' there speak another language since my facebook account is only for games.

I'll try to distract myself by finding a game to play, but realizing that only human interaction will satisfy me, I'll quickly get bored and shut the game down.

Rinse and repeat.

I'll do this five or six times before becoming slightly depressed and going to bed.

Loneliness normally does not trigger in me until I am ready to fall asleep. That is when my mind replays how the day went and thinks of what is going on in my life. The thoughts of a significant other usually trigger here, thus cuing my loneliness. I can usually dismiss this, think about all my friends, my fun plans I have coming up soon, but there are some nights where you cannot fight the bad thoughts with good thoughts, and that is when I get creative in how I handle it.

Sometimes I fantasize about someone being there, holding me, or I holding them. I may even create a story to fit this scenario to help my mind accept this delusion. This works a fair amount of the time, but not always.

Sometimes I take a pillow and cover it with a long sleeve shirt, then wrap the loose sleeves around myself, simulating the feeling of being held. I do not do this often, but it really does help when combined with my last solution.

Sometimes I try clearing my mind. I have sometimes found ways to make myself fall asleep. Usually getting an image in my head to start, then letting any other images that may trigger just come forth, as if not concentrating, letting the images overwhelm me. This works better if I am really tired and not distracted by a sickness or soreness.

When all else fails, I tend to get up and find something to distract my mind. Playing games or surfing online mindlessly usually does the trick. I use that for when I feel lonely and not getting ready for bed, too. Loneliness in the day can be treated easier for me though, since people are awake and I can text somebody to start a conversation with, or go up to my dog and play with her, or even just hold her for a bit. At night, she and everyone else is asleep or trying to get to sleep, so that does not work as well.

I have not been terribly afflicted with loneliness these days, but I have also been keeping myself busy enough that the thoughts do not cross my mind much. I just figure I will find my special someone someday and just keep living each day through.

Honestly, I don't really recall times where I get lonely. For the most part, I have never really NEEDED people. Do I have a great time hanging out with friends? Yes. Is it often more fun that being home by myself? Most of the time. But do I ever have a bad time being alone? Not really. Though I usually have more fun hanging out with some friends, I am more than entertained and content being by myself, no matter how many days in a row it is. I can honestly say i do not get lonely. 

So for me, this is just a 'what do you do when you are alone' instead of a 'what do you do when you get lonely'. I watch TV, play video games, work out, clean, or spend time with the dogs. I know the last one TECHNICALLY is having someone next to me, but they aren't people. I take the dogs out for walks or to the park. I play with them. Stuff like that. 

Although, I am rarely alone for more than a couple hours nowadays. Pretty much for the past 4 years, which is when my wife and I moved in together (she was my fiance then). So this is what I do on the rare occasions she is out of town for one day, a couple days, or just out with a friend (she needs people more than I do).

Alone at home?
Simple, I open up Google Chrome's Incognito mode and look up [CLASSIFIED] while [CLASSIFIED].

Alone in a public place?
That's not as fun as when I'm home alone, Nya~.

I'm not completely sure I can answer that properly, because I'm always lonely. I was an only child with a single parent who was always at work.

Mostly play video games or watch television, whenever I'm not at school - pretty much the same thing I've been doing since the 1990s. My life cycle was wake up ---> school ---> homework  ---> Nintendo 64 ---> sleep ---> repeat
I guess I added browse the Internet to that list, as technology grew. And for some strange reason, I like to read up on credit score facts. Yeah, I can't explain it either. Isn't it fun to know the average credit score is 664? Of course not. No one except me finds that fun.

I kind of have a bad habit. Moping.

I wasn't an only child, so I was used to having a brother and sister around to bug me. Now that I'm not living with them... I'm lonely a lot more often.

It gives me a lot of time to reflect on what I had, and what I have, and what I want and how I'll get it.

I dunno. I kind of hate it.

Usually, when I'm lonely, I mope around until one of the few friends that I have actually get online. Then, I'll talk to them until they leave, mope around some more, try to play games, fail because it's just not as satisfying as social interaction, mope around even more, try to play Call of Duty, realize that I'm not going to randomly meet anybody worth talking to while trying to kill each other, give up, play Sims, or go to sleep.

Alcohol helps.