Constantly moving from country to country, from city to city, from high school to high school, then from high school to college, I came up with pretty comprehensive way to make new friends. It’s not really difficult to do this; you just have to put effort into doing it.
Considering you’re a college student, freshman or just transferred, you need to make friends. Follow those simple steps.

Join couple clubs and groups:
This should be NO-BRAINER, but many people miss it.
Go to your college home page online. Search for Clubs and/or Organizations.
Find ones you like.
Look up how to join.
Some suggested categories to look into: Social, Leadership, Arts, Recreational, Sports, Travel, etc. Religious organization or political ones typically require a lot of work. You don’t have to be passionate to be part of Karate Club, but you’ll have to put ass-sweating work to be part of Young Republican Volunteers (and not get paid for it). Religious organizations usually have mission trips, community work, and other stuff. Just keep in mind some clubs demand more of your time.
Naturally, check out the Social groups:
There is really no way to word this any better and simpler. Social groups do party. A lot. End of story.

Consider (Your City’s Name) Young Professional Network/Club
Nearly ALL BIG cities have one. Check with your local Chamber of commerce department. If not, Google it.
Those guys get together with a purpose and without a purpose. Primary function of those clubs is to network with other young professionals and businesses.

Add friends on Facebook from your classes. If you’re not on Facebook.com or Myspace.com you need to create account ASAP!
Start friendly conversation with guys and girls after or before class; talk about homework, group projects, or whatever else interests you. Typically a class you’re taking with them will be a neutral topic of discussion.
If things are going great ask for facebook or myspace, or number.

Check out local groups on facebook. Join them. A lot of events get posted on facebook. Also not to overlook event pages, special and promotional events, student events, and other activities eagerly advertised on the social network.

Do same with myspace.

Eventually Join A Fraternity/Sorority. Do NOT rush anything yet. (did you get that pun?) If you’re a freshman, chill. …here is why:

You need to get to know someone who is already in greek house, otherwise, you’ll just be one of the “bid-wanna-be’s” and never get a bid. Fraternities and sororities, usually, ones that are popular, don’t just accept everyone that rushes them. Make friends first then join the house, you will get good reference from your friends.

Check out your student union center (or student center) and look for events, concerts, social gatherings. Most of it will be sponsored by University: aka free or ridiculously cheap. Invite friends you already have to come with you.

LIVE IN DORM, for both social aspect and academic aspect. It’s nice to be in walking distance to classes and parties. Dorms are fun; experience will help you work and live with people. It will also open up opportunity for making new friends.

Come to study groups for classes. Nothing brings students closer together then common frustration about ridiculous subject you have to take.

Try getting a part time job near campus. Working in a coffee shop or a library can give you chance to interact with people all day. If it’s a popular coffee shop that students frequent, you’ll be recognized elsewhere “hey, you work at campus starbucks, don’t you?”

Buy at least ONE text book at a bookstore. During quarter/semester begining all textbook stores are slammed with people. Like it or not, you’ll end up standing in line anyways, what are the chances you can strike up a conversation with some cute girl or guy?

Find Your School’s Online Social Networking Site. Pretty much every single large college has a social online network where a lot of students hang out. It’s usually a forum with classified. Find it and join.
Join Uloop.com if you guys have it at your college; also check out Juicy Campus (www.juicycampus.com) for shits and gigs, really not going to help you being social, but something to kill time online.

ALWAYS ask your social friends what they are doing on the weekend. If they invite you to whatever they are doing, go hang out with those guys. You should not say “no” to any social event UNLESS you have loads of class work to do. Focus on staying in school as well as partying. Don’t overload your academic load first year, get a feel for the college. Even if you barely meet full-time status, it’s much better to make friends at the beginning than graduating in 2-3 years with double major, and half way to your masters, and no friends or girlfriend. Social life is just as important as academic life. Balance both and you’ll be in good shape. Healthy social circle will help you advance your career and find a job when you graduate. Most well paid job out of college come through reference (I highly recommend joining Fraternity or Sorority).

Go to your college gym. It’s amazing the amount of friends/girls you can meet while working out. Be social.

Go to games sporting  events. Absolutely show your spirit. Even if it’s a wrestling match, show up, cheer, and be open to talking to others. You should bring friends too. Smaller sport events can be easier and cheaper to get tickets for, and better for socializing.

Invite Friends Out. I am sure you have at least one or two people you hang out with, invite them to concert, bars, clubs, or anything to do around campus.
Study outside if weather permits. Just being out in the sun will do wonders to your attitude and you will also get a tan :)

Play sport. Even for a club, if you cannot make it on College team. Sport clubs hang out often outside of practice and games.
Take a yoga class or art class. You have to take electives ANYWAYS, so take something where you can interact with other people. Typically creative classes, that require group work, will be more interesting than introverted classes like Creative Writing or History. Consider drama class, or improv. comedy.

Talk to other freshmen or sophomores. Ask them what they do for fun. “Hey bro, anything to do around here? It’s wed, and i still have nothing to do for friday or saturday?”
Don’t drink and drive

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